exam Maths Puzzle Numerical Ability

how would you solve {{{x^2+7/8x-x/8}}} and {{{a+a/5+2/5a}}}

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exam Other Question

Evaluate 4*sqrt81, if possible. The sqrt of 81 is 9 so would it be 4*9=36? the square root of x-5 minus the square root of x - 8 = 3