exam Maths Puzzle Numerical Ability

solve by facotring (multiple choice question)

9x^3-40x^2-25x=0

choices:
a: 5/9, -5
b. -5/9, 5
c. -5, 0, 5/9
d. -5/9, 0, 5.

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exam Other Question

Factor the following into the product of two binomials. Then, confirm your answer is correct by multiplying the two binomials:

x2 - 36
I have about five problems that I could not workout on my quiz and this is one of them 0.4x+2.5=-7.5 can someone work it out in detail for me please.