Question

Which trinomial is the product of the binomials (4n + 5m)(3n – m)?
A. 7n^² + 4mn – 5m^²
B. 12n^² + 11mn – 5m^²
C. 12n^² + 11mn + 5m^²
D. 12n^² + 19mn – 5m^²

Answer 1

do you know how to do this? you need to do four multiplications

Answer 2

what is \(4n\times 3n\)?

Answer 3

12n

Answer 4

not quite

Answer 5

\(4\times 3=12\) but \(n\times n=n^2\) so it is \(4n\times 3n=12n^2\) for the first term

Answer 6

that eliminates answer A

Answer 7

how about \(5m\times (-m)\)?

Answer 8

4m

Answer 9

no, you are not adding, you are multiplying

Answer 10

Is it 5m^-2

Answer 11

no

Answer 12

-5m^2

Answer 13

oops, that eliminates C

Answer 14

I was kinda close, just had my negative in the wrong spot

Answer 15

right
two more \(4n\times (-m)+5n\times 3m\)

Answer 16

It b.

Answer 17

So it would be B?

Answer 18

yes

Answer 19

Yes

Answer 20

Thanks.

Answer 21

yw