exam Maths Puzzle Numerical Ability

f(x) = x^2-x-2; find (a) f(0) (b) f(-2) and (c) f(1)

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I am stuck on correct answer for:

(3 X 10^2) X (2 X 10-3)=:

The 10-3 is actually (10 to negative 3rd power) but I can't show that correctly in email.

I am not using a spec what is the difference of 3 and 5 times a number? a(b+c) is the equations I am suppose to use