Question

Find the product.

(3p – 7)(3p + 7)

a. 9p^2 – 49

b. 9p^2 + 42p + 49

c. 9p^2 + 49

d. 9p^2 – 42^p – 49

Answer 1

Use \( a^2 - b^2 \) where (a - b)(a + b)

Answer 2

Do you understand?

Answer 3

no

Answer 4

\( a^2 \) = 3p time 3p = \( 9p^2 \)
can you solve for \( b^2 \) which is \(-7^2\)

Answer 5

......

Answer 6

Do you know how to do exponents ?

Answer 7

What is \(2^2 \)

Answer 8

yea

Answer 9

4

Answer 10

Ok, what is \( -7^2 \) ?

Answer 11

49

Answer 12

Yes, so \( 9p^2 + 49 \) is the answer

Answer 13

We just used the formula known as a^2 + b^2 It is a fast way of doing these types of problems when you have the same numbers in the factors, which is (3p - 7) (3p + 7) and when you have different signs, which we have a + and a -

Answer 14

You could of used the FOIL method but it is a lot longer.