Factor 4y^2-4

Math
4y2-4
Factor 4 out of 4y2-4.
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Factor 4 out of 4y2.
4(y2)-4
Factor 4 out of -4.
4(y2)+4(-1)
Factor 4 out of 4(y2)+4(-1).
4(y2-1)
4(y2-1)
Rewrite 1 as 12.
4(y2-12)
Factor.
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Since both terms are perfect squares, factor using the difference of squares formula, a2-b2=(a+b)(a-b) where a=y and b=1.
4((y+1)(y-1))
Remove unnecessary parentheses.
4(y+1)(y-1)
4(y+1)(y-1)
Factor 4y^2-4

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