exam Maths Puzzle Numerical Ability

(x^7-x^5)(x^3-4)

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exam Other Question

Given f(x)=-x3+x2+3x+4, find f(-1), f(0), and f(1)

The 3 and the 2 are powers of the x.
I cannot figure this out. I tried systems of equations, both substitution and elimination, but could not get it to solve. Thanks

If cd=4 and C^2+d^2=10, what is (c+d)^2