exam Maths Puzzle Numerical Ability

Simplify:
(5-i squrt3)(5+i sqrt3)
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exam Other Question

LET f(x)=x3-8x2+17x-9. USE THE FACTOR THEOREM TO FIND OTHER SOLUTIONS TO f(x)-f(1)=0,BESIDES x=1. 2a+15 over a^2-7a+12 - 11a over a^2-7a+12 =

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