Question

Multiply and simply the expression
(5b-3)(6b-5)

Answer 1

so far I have 11b^2-25b-18b-15

Answer 2

11b^2-25b-18b+15

+15, not -15

Answer 3

do you have to combined -25 and -18b?

Answer 4

(5b - 3)(6b - 5)
= 5b(6b - 5) - 3(6b - 5)
= 30b^2 - 25b^2 - 18b + 15
= 30b^2 - 43b^2 + 15

Answer 5

What I don't understand is how -25b and -18b have to have b^2? when we already have a b^2, doesn't seem that the polynomial is correct?

Answer 6

-25b and -18b are like terms. You have to combine them. Did you not see the steps I provided above?

Answer 7

I did, okay makes sense so in the end it's 30b^2-43b^2+15

Answer 8

Correct

Answer 9

okay gotchya!

Answer 10

when finding the product it is the same thing?

Answer 11

??/