Question

Solve: x(10x+3)(x+4)=0

Answer 1

@dpasingh

Answer 2

x(10x+3)(x+4)=0

x(10x^2 + 40x + 3x + 12) = 0

10x^3 + 40x^2 + 3x^2 + 12x = 0

10x^3 + 43x^2 + 12x = 0

Does that look right?

Answer 3

@hoblos does that look right ^ ?

Answer 4

what you did is expanding not solving
to solve means to find the value of x so that x(10x+3)(x+4) is equal to 0

Answer 5

so how can I do that ?

Answer 6

set each factor =0 and solve

x=0
10x+3=0
x+4=0

solve these three equations

Answer 7

Yeah, sorry, I did not exactly know how to do that. That's why I asked.

Answer 8

Alright Lol Im kind of rushing I have two more questions and I leave to class in 10 min

Answer 9

you got it @cancherolugano ?

Answer 10

yea but I just don't know how to show the work for it

Answer 11

x=0
10x+3=0 so 10x=-3 , x=-3/10
x+4=0 so x=-4

thus the solution set is {-4, -3/10, 0}