Question

Multiply: (x-4)(x+3)

tell me if i did it right (-3x)(4x)=-12x

Answer 1

actually...the "x" part isn't..

Answer 2

what do you mean

Answer 3

hmm x^2

Answer 4

x times x does not equal to x. let me show an example for better understanding

(ax)(bx) \(\ne\) abx

Answer 5

use distributive law
multiply second bracket first by then by -4

x(x + 3) - 4(x + 3)

Answer 6

* first by x

Answer 7

but how did you get the two 3s

Answer 8

^asking that, i would assume he knows FOIL...?

Answer 9

x + 3 is the contents of the second brackets
first multiply it by x then multiply it again by -4

Answer 10

ohh ok

Answer 11

gustavo have you heard of FOIL?

Answer 12

if not thats ok - it might be confusing

Answer 13

can you continue ?
i'll start it off

x(x + 3) - 4(x + 3)

= x*x + 3*x -4*x -4*3