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The first three steps in writing f(x) = 40x + 5x2 in vertex form are shown.Write the function in standard form.f(x) = 5x2 + 40xFactor a out of the first two terms.f(x) = 5(x2 + 8x)Form a perfect square trinomial. = 16f(x) = 5(x2 + 8x + 16) - 5(16)What is the function written in vertex form?f(x) = 5(x + 4) - 80f(x) = 5(x + 8) - 80f(x) = 5(x + 4)2 - 80f(x) = 5(x + 8)2 - 80
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