exam Maths Puzzle Numerical Ability

Find the maximum value of y = -x^2 + 6x. The answer I got was 8 but it was not correct.

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exam Other Question

I am needing to perform the indicated operation and express the problem in lowest terms....can you please assist? Thank you.
2ab/a2(squared)- b2(squared) - b/a-b + 2 write all real roots of the equation as a decimal.
8. x to the power of 3= 125