exam Maths Puzzle Numerical Ability

graph function

y=-2xsquared-4x+2

i just dont understand how 2 do this

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exam Other Question

Cos^2(4x) + sin^2(4x) what does x =? graph the solution set for the equation
y=-2/3x-2

i am trying to use Graph but it does not seem to be working for this problem.

please help