SOLUTION: y=x^2-4

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Question 68715This question is from textbook Algebra 1 An Integrated Approach
: y=x^2-4 This question is from textbook Algebra 1 An Integrated Approach

Answer by tutorcecilia(2152) About Me  (Show Source):
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y=x^2-4
y=(x+2)(x-2) [factor]
0=x+2 [set each factor equal to zero and solve for x]
x=-2
or
0=x-2
x=2
.
check by plugging either +2 or -2 back into the original equation.