Asked by ARIANA

solve the polynomial by factoring
(I know i can factor out 3x^3, but again idk what to do after that) thanks a bunch!

-12x^5 -15x^4 + 21x^3=0

Answers

Answered by oobleck
-12x^5 -15x^4 + 21x^3
= -3x^3 (4x^2+5x-7)
you can always use the quadratic formula. Since the roots are
(-5±√137)/8
you know that it cannot be factored using rational coefficients
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