Question

Which shows 60^2 − 40^2 being evaluated using the difference of squares method?

Answer 1

The difference of squares method uses the following formula:

$a^{2} - b^{2} = (a+b)(a-b)$

Answer A has the squares multiplied out, then put into the formula, which is incorrect.

Answer B does not use this formula, as the squares are multiplied out and solved without using this method.

Answer C subtracts in terms of the power, which is completely wrong.

The answer is D.