exam Maths Puzzle Numerical Ability

3x2-6x + 9

x= -2

(thats suppose to be square x (x2) not sure how to show it that way

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exam Other Question

How do i find standard form of a slope of negative 6/5 and a y intercept of negative 2? how do i combine like terms:

4(2x+y) - 2 (2x+y)