Question

Solve 4x2 = 12x + 40. factoring

Answer 1

\[4x^2=12x-40\]

Answer 2

is that it?

Answer 3

yes

Answer 4

I don't understand how you arrived at that answer....

Answer 5

@jim_thompson5910 I don't understand how they got that.... Can you help me? I don't want to cheat....

Answer 6

4x2 = 12x + 40
4x2 - 12x - 40 = 0
divide by 4 all sides, giving us
x^2 - 3x - 10 = 0
factor out!
(x-5)(x+2) = 0
setting each factor be equal 0
x-5 = 0
then x = 5
also x+2 = 0
then x = -2
so, the solution is {-2, 5}