Algebra
Calculus
Trigonometry
Matrix
Question
Factor the expression
(2−x)(2+x)
Evaluate
4−x2
Rewrite the expression in exponential form
22−x2
Solution
(2−x)(2+x)
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Find the roots
x1=−2,x2=2
Evaluate
4−x2
To find the roots of the expression,set the expression equal to 0
4−x2=0
Move the constant to the right-hand side and change its sign
−x2=0−4
Removing 0 doesn't change the value,so remove it from the expression
−x2=−4
Change the signs on both sides of the equation
x2=4
Take the root of both sides of the equation and remember to use both positive and negative roots
x=±4
Simplify the expression
More Steps
Evaluate
4
Write the number in exponential form with the base of 2
22
Reduce the index of the radical and exponent with 2
2
x=±2
Separate the equation into 2 possible cases
x=2x=−2
Solution
x1=−2,x2=2
Show Solution