Question 534393
factor
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-x^2 +2x +63 = 0
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(-x -7)(x -9)
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Check using FOIL.
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-x^2 +9x -7x +63 = -x^2 +2x +63
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Roots
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x = -7 or 9
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{{{ graph(500,500,-10,15,-20,70,-x^2+2*x+63) }}}
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By inspection, you can see the y-intercept is (0,63).
You also can find it by setting x=0 and solving the equation.