Question

how to solve 3r^5+3r^4-90r^3

Answer 1

3r^3(r^2+r-30)=0

Answer 2

no i have to factor it, not find what r =

Answer 3

then you are done
3r^3(r^2+r-30)

Answer 4

why?

Answer 5

you just factored it

Answer 6

but it isn't in the form (a-b)^2

Answer 7

sadsel, (a-b)^2 isn't the only way.

What myko provided is valid.

Answer 8

so the way i factored it was correct ? why is is that it cannot be in that form?

Answer 9

Because it's a different equation. you can't always use (a-b)^2. Factorizing is basically taking out what's common in an equation and using it as a multiplier in a second equation. usually to simplify an equation.
In this example 3r^3 is common.

Answer 10

thank you