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posted by ladybug on Sunday, October 28, 2012 at 8:49pm.

if (a,-20) is a point on the graph of y=x^2+9x, what is a?

solve for x: -20 = x^2 + 9x x^2+9x+20 = 0 (x+5)(x+4) = 0 so, a = -4 or -5

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