book Maths Puzzle Numerical Ability

5(x+5)=25+5x

a) -5 b) 0 c) all real numbers d) no solution

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book Other Question

Find all roots of the polynomial x3 � x2 + 16x � 16. How to find the value when x^4 - 4x^3 + 16x - 16 and x=5/2?