If (a,12) is a point on the graph of y=x^2+x, what is a? How should i go about finding this answer?
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Originally Posted by kmerr98277 If (a,12) is a point on the graph of y=x^2+x, what is a? How should i go about finding this answer? Can you solve $\displaystyle a^2+a=12~?$
You have (a, 12) as a point on y = x^2 + x, so that means 12 = a^2 + a. Solving this gives a^2 + a - 12 = 0 (a + 4)(a - 3) = 0 a + 4 = 0 or a - 3 = 0 a = -4 or a = 3.
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