exam Maths Puzzle Numerical Ability

(a-b)^5 is this possible?

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Hi I just want someone to check to see if I did this right.

Quadratic equation

4x cubed -36x=0

4x (x squared -9) = 0

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

x=3 , x=-3 , and x=0

Is this right?

Thanks you
for the following function, one zero is given. find the other zeros.
P(x)=x^3-6x^2+3x+10; -1