exam Maths Puzzle Numerical Ability

Solve for x:2 to the power of x^2 -5x = 8

Please show steps

Thank you:)

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exam Other Question

Find the equation of a circle with center (2,4) that passes through (1,7). lowest terms

u^2+16u+63/u+7 * 1/u+9

i got the answer

u^2+16u+63/u^2+16u+63=1

Is this right?