exam Maths Puzzle Numerical Ability

For about what value(s) of x does g(x)=k(x) if g(x)=2x^2 -8 and k(x) =-x^2 -2?

x~ +or-2
x~ +or-2.3
x~ 1.4
x~ +or- 1.4

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The length of a rectangular playing field is 5 feet less than twice its width. If the perimeter of the playing field is 230 feet, find the length and width of the field. Explain how the graph of y-5=(x-3)^2 can be obtained from the graph of y=x^2.