Question

The product of (a - b)(a - b) is a2 - b2.
Always
Never
Sometimes

Answer 1

Sometimes

Answer 2

sometimes ????? when???

Answer 3

never..-b by minusb gives +b^2

Answer 4

for a = b = 1, or a = b = 0

Answer 5

or if a = b, for any number

Answer 6

right - of course

Answer 7

:)