Question

-2r(8r+5)

A. -16r^2 + 5
B. -16r^2 +10
C. -16r^2 -10r
D. -16r^2 -10

Answer 1

distributive property works like a(b+c) = ab + ac
so -2r(8r+5) = (-2r)(8r) + (-2r)(5) multiply and simplify :)

Answer 2

nicely explained :)

Answer 3

I don't get it? @jigglypuff314

Answer 4

hmmm what do you not understand? :)

Answer 5

how to solve the problem

Answer 6

well I explained how to do the first step, do you understand that? :)

Answer 7

no :/

Answer 8

It's like the idea that you want to give the outside number to the inside numbers

for example,
3(x+8) you would give the 3 to the x and then you would give the 3 to the 8
so = 3x + (3)(8) = 3x + 24

do you understand that? :)

Answer 9

yes

Answer 10

then it's the same idea for -2r(8r+5)

you want to give (-2r) to the 8r
and the (-2r) to the 5

so you get (-2r)(8r) + (-2r)(5)

Answer 11

yes thanks

Answer 12

then the step after that would be to multiply

like (-2r) times (8r) = (-2times8)r² = -16r²

Answer 13

I got A. after I solved the problem is this right? :D

Answer 14

hmmm not quite :)

(-2r)(5) = -2r times 5 = (-2 times 5) r = ?

Answer 15

-10

Answer 16

don't forget the r :)

so -10r