book Maths Puzzle Numerical Ability

Identify the polynomial written as a product of linear functions.
f(x)=x^4-15x^2-10x+24

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book Other Question

If f(x)=2x^2-5x-3, then f(-3)=

A)0
B)30
C)18
D)48

Please show me step by step how this works How do you solve for x in this equation?
A=B^x, when A and B are constants.