exam Maths Puzzle Numerical Ability

Factor 4x2 - 20x + 25. Select the answer.

2x-5
(2x-5)2
(2x+5)2
2x+5
none of these

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exam Other Question

My teacher came up with this problem.
You must multiply the matrices.

[ 2 0 1] x [-2 3]

[-3 4 0] x [4 -1]

x [

f(x)=x^3-5x^2-14x

f(x)=x^3+4x^2+9x+36

f(x)=x^4+x^3-2x^2+4x-24

please helpp!