Question
What is the value of x in 
Hint:
|x| is known as the absolute value of x. It is the non-negative value of x irrespective of its sign. The value of absolute value of x is given by
So, we will get two cases in the solution of the given equation. We simplify the equation as much as possible and then apply the above definition to get the value of x.
The correct answer is: x = 5, -5
Step by step solution:
The given equation is
7 = |x| + 2
Subtracting 2 from both sides, we get
7 - 2 = |x|
Simplifying the above equation, we can write
|x| = 5
Using the definition of absolute value,
We get two possibilities,
For x < 0,
|x| = -x = 5
Thus, we get
x = -5
For x ≥ 0,
|x| = x = 5
We have
x = 5
Hence, we get two values of x satisfying the given equation,
x = 5, -5
Absolute value of a variable has many uses in mathematics. Geometrically, the absolute value of a number may be considered as its distance from zero regardless of its direction. The symbol |.| is pronounced as ‘modulus’. We read |x| as ‘modulus of x’ or ‘ mod x’.
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