exam Maths Puzzle Numerical Ability

y=3(x+5)(x-2)

Which of the following formulas is equivalent to the this one?

a. y=3x^2+9x-30
b. y=x^2+3x-10
c. y=3x^2+3x-10
d. y=3x^2+3x-30

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exam Other Question

If the zeros of the polynomial x^3-9x^2-54x+c=0 form a geometric progression, then c=(?). (2n+2)(2n-2)