Simplify the expression 5x-(3x^2+9x) ?

Question

anonymous · Answer

are we simplifying?

anonymous · Answer

Yeah it says simplify the expression.

uri · Answer

5x-(3x^2+9x) ? 
Multiply 5x with the whole bracket.

anonymous · Answer

@uri i don't think that is correct, you would want to distribute the - sign first

uri · Answer

Yeah..we will do that while mutiplying, @robz8

anonymous · Answer

@uri why would we distrubute 5x then

it is 5x - (3x^2 + 9x) 

not 5x(3x^2 -9x)

uri · Answer

I do that in the way i understand it,you go ahead help her,I'm watching :3 @robz8

anonymous · Answer

@uri ummm i don't know how that way would work haha...

but i would distribute the negative sign throughout the parenthesis first

so -(3x^2 + 9x) ----< -3x^2 - 9x

so now we have

5x - 3x^2 - 9x

now we just subtract like terms

-3x^2 - 4x

that could be a simplified answer, but we can factor out a -x if we want

so we get

-x(3x + 4)


that's how i would do it :)

anonymous · Answer

My only options are
 -3x^2-4x

-3x^2+14x

3x^2-4x

3x^2+14x

anonymous · Answer

look at my work, you will see the answer in there

anonymous · Answer

Thank you (:  @robz8

anonymous · Answer

@rockyromero you're welcome!