exam Maths Puzzle Numerical Ability

write all real roots of the equation as a decimal.
8. x to the power of 3= 125

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exam Other Question

Find the maximum value of y = -x^2 + 6x. The answer I got was 8 but it was not correct. Rewrite the middle term as the sum of two terms and then factor completely.

4z squared -18z squared -10z