Math

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If (a,-3) is a point on the graph of y=x^2+4x, what is the value of a?

so far i have -3=x^2+4x

i can do the problem on my graphing calc but we can't use a graphing calc on the test so i need to know how to do it by hand. what do i do next?

  • Math -

    your equation would be
    -3 = a^2 + 4a
    a^2 + 4a + 3 = 0
    (a+1)(a+3) = 0
    a = -1 or a = -3

  • Math -

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