Question

factor then use zero product principle

5x^3+3x^2=125x+75

Answer 1

x^2(5x+3)=75(5x+3) ==> x^2=75 ==> x=5sqrt(5) or x=-5sqrt(5)

Answer 2

x=5sqrt(3) or x=-5sqrt(3)

Answer 3

take:

5x^3+3x^2-125x-75=0

(5x+3)(x^2-25)=0

5x+3=0===>x=-3/5

x^2-25=0===>(x+5)(x-5)===>x-5 and x=-5

Answer 4

thats what i did thanks!! :D

Answer 5

np