what is (y+9) (y-9). And also what is the formula used over here?
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your formula is (a+b) (a-b)
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Answered by
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(y+9)(y-9)
=(y^2) - (9^2)
y^2 - 81
This type of problems can be solved by the arithmetic identity
(a-b)(a+b) = a^2 - b^2
=(y^2) - (9^2)
y^2 - 81
This type of problems can be solved by the arithmetic identity
(a-b)(a+b) = a^2 - b^2
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