exam Maths Puzzle Numerical Ability

Please help me solve this equation:
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(6+5x+6x^2+8x^3)+ (3-5x+6x^2-8x^3)

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exam Other Question

solve the quadatric equations by factoring

(x-1)^2=7
I would apprecaite some help with :

Simplify

5^5 times the square root of -32