Question

Which products result in a difference of squares? Check all that apply.
(5z + 3)(–5z – 3)
(w – 2.5)(w + 2.5)
(8g + 1)(8g + 1)
(–4v – 9)(–4v + 9)
(6y + 7)(7y – 6)
(p – 5)(p – 5)
@aveline

Answer 1

Difference of squares rule
\[\Large a^2 - b^2 = (a+b)(a-b)\]

Answer 2

Example:
\[\Large x^2-25 = x^2-5^2 = (x-5)(x+5)\]

Answer 3

I believe that only numbers 2 and 4 are those that are correct for this question.