Question

Am I right? Medal.

The product of (a + b)(a - b) is a perfect square trinomial.

A. Sometimes
B. Always
C. Never

I think its A.

Answer 1

expand it out

Answer 2

(a+b)(a-b) = a^2 - ba + ba - b^2
simplify it to get a^2 - b^2

Answer 3

"Trinomial" is a term for a 3 term equation
(a+b)(a-b)=
a^2-ab+ab-b^2 combine like terms is there 3 terms?

Answer 4

No, there is 4, so its a polynomial... So its C?

Answer 5

Combining like terms there will be 2 terms so it would be a Binomial yes C

Answer 6

i think this is called the difference of squares rules. It is worth remembering and no it is not a trinomial ever.

Answer 7

Thanks ^-^

Answer 8

yep difference of 2 squares

Answer 9

you're welcome

Answer 10

you'll need it a lot when rationalizing denominators.