Question 1117498
f(x) = -x^2 +2x +3
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this is a parabola that curves downward
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the x coordinate for the vertex is -b/2a = -2/2(-1) = 1
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f(1) is the y coordinate(highest point of the parabola) = -(1^2) +2(1) +3 = 4
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{{{ graph( 300, 200, -11, 13, -140, 10, -x^2 +2x +3) }}}
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range of f(x) over the real numbers is f(x) < or = 4
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