exam Maths Puzzle Numerical Ability

please help me solve

(x^2 + 6x) - (2x^2 -3)

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exam Other Question

Determine if the given numbers are solutions of the inequality.
7, -12, -14, -2

y-8>2y-2

Help me i do not no how to do these correctly What are the x-intercepts of the graph of y=-xsquared-6x+40