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## Answers

(x+4)(x-4)= x²-16

(x+6)(x-6)= x²-36

(a+b)(a-b)= a²-b²

(x+y)(x-y)= x²-y²

Just square the first and last terms and use the negative sign. :)

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(x+4)(x-4)= x²-16

(x+6)(x-6)= x²-36

(a+b)(a-b)= a²-b²

(x+y)(x-y)= x²-y²

Just square the first and last terms and use the negative sign. :)