How do you solve \[\left| {2x - 3} \right| = \left| {x + 2} \right|\] ?
Answer
625.2k+ views
Hint: The given equation is in the form of absolute values. We will remove the absolute sign, consider the positive sign first, and solve it to get on of the solution. Then we will take the negative sign and solve it further to get the second solution. Thus, the solution set is the required solution.
Complete Step by Step Solution:
We are given that \[\left| {2x - 3} \right| = \left| {x + 2} \right|\]
So, removing modulus, we get
\[\left( {2x - 3} \right) = \pm \left( {x + 2} \right)\]
Now, we will consider the equality with only the positive sign, thus we get
\[ \Rightarrow \left( {2x - 3} \right) = + \left( {x + 2} \right)\]
Thus, we get
\[ \Rightarrow 2x - 3 = + x + 2\]
By rewriting the equation, we get
\[ \Rightarrow 2x - x = 2 + 3\]
Subtracting and adding the like terms, we get
\[ \Rightarrow x = 5\]
Now, we will consider the equality with only the negative sign, thus we get
\[\left( {2x - 3} \right) = - \left( {x + 2} \right)\]
Thus by rewriting the equation, we get
\[ \Rightarrow 2x - 3 = - x - 2\]
By rewriting the equation, we get
\[ \Rightarrow 2x + x = - 2 + 3\]
Subtracting and adding the like terms, we get
\[ \Rightarrow 3x = 1\]
Dividing both sides by 3, we get
\[ \Rightarrow x = \dfrac{1}{3}\]
Therefore, the solution set of \[\left| {2x - 3} \right| = \left| {x + 2} \right|\] is \[x = 5\] and \[x = \dfrac{1}{3}\].
Note: We know that the absolute value is defined as the non-negative integer without regard to its sign, it can be either a positive or negative integer. We will follow these steps to solve absolute value equality which contains two absolute values. We will write both the equations without absolute values. The first set of equations will set the quantity inside the bars on the left side of the equation equal to the quantity inside the bars on the right side of the equation and then solve the linear equation formed. The second set of equations will set the quantity inside the bars on the left side of the equation opposite to the quantity inside the bars on the right side of the equation and then solve the linear equation formed. Thus, the solution set for the linear equation.
Complete Step by Step Solution:
We are given that \[\left| {2x - 3} \right| = \left| {x + 2} \right|\]
So, removing modulus, we get
\[\left( {2x - 3} \right) = \pm \left( {x + 2} \right)\]
Now, we will consider the equality with only the positive sign, thus we get
\[ \Rightarrow \left( {2x - 3} \right) = + \left( {x + 2} \right)\]
Thus, we get
\[ \Rightarrow 2x - 3 = + x + 2\]
By rewriting the equation, we get
\[ \Rightarrow 2x - x = 2 + 3\]
Subtracting and adding the like terms, we get
\[ \Rightarrow x = 5\]
Now, we will consider the equality with only the negative sign, thus we get
\[\left( {2x - 3} \right) = - \left( {x + 2} \right)\]
Thus by rewriting the equation, we get
\[ \Rightarrow 2x - 3 = - x - 2\]
By rewriting the equation, we get
\[ \Rightarrow 2x + x = - 2 + 3\]
Subtracting and adding the like terms, we get
\[ \Rightarrow 3x = 1\]
Dividing both sides by 3, we get
\[ \Rightarrow x = \dfrac{1}{3}\]
Therefore, the solution set of \[\left| {2x - 3} \right| = \left| {x + 2} \right|\] is \[x = 5\] and \[x = \dfrac{1}{3}\].
Note: We know that the absolute value is defined as the non-negative integer without regard to its sign, it can be either a positive or negative integer. We will follow these steps to solve absolute value equality which contains two absolute values. We will write both the equations without absolute values. The first set of equations will set the quantity inside the bars on the left side of the equation equal to the quantity inside the bars on the right side of the equation and then solve the linear equation formed. The second set of equations will set the quantity inside the bars on the left side of the equation opposite to the quantity inside the bars on the right side of the equation and then solve the linear equation formed. Thus, the solution set for the linear equation.
Recently Updated Pages
If x a + bt + ct2 where x is in meters and t is in class 11 physics CBSE

A car covers the first half distance between two places class 11 physics CBSE

The resultant of two vectors overrightarrow P and overrightarrow class 11 physics CBSE

Find the value of cos 135 class 11 maths CBSE

A mass M is held in place by an applied force F and class 11 physics CBSE

A solution of glucose in water is labelled as 10 dfracwv class 11 chemistry CBSE

Trending doubts
Find the value of the expression given below sin 30circ class 11 maths CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

Draw a diagram of nephron and explain its structur class 11 biology CBSE

10 examples of friction in our daily life

Proton was discovered by A Thomson B Rutherford C Chadwick class 11 chemistry CBSE

Bond order ofO2 O2+ O2 and O22 is in order A O2 langle class 11 chemistry CBSE

