exam Maths Puzzle Numerical Ability

Find the value of a such that P(x)=ax^2-4x+2 has a maximum value is 16.

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exam Other Question

x
- + 13 = 20
2
Help im having a hrad time with these problems. Please break them down so i can learn the steps to solving them. Thank you



1. Simplify and evaluate:
(x7y-4z0/5-2x3y-8z-