exam Maths Puzzle Numerical Ability

Factor the polynomial by grouping the first two terms and the last two terms.

x to the 3rd power - 4x squared + 2x -8

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exam Other Question

EVALUATE EACH EXPRESSION: 7P3 Please help me solve these problems.
Factor. Check by multiplying
4x^5 y^3+16x^3 y^2+32xy and
9x^2=72x and
factor by grouping
21x^3-15x^2+28x-20.
Thank you very much!