Solving Quadratic Equations: Quadratic Formula — Unit test Answers
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The first few steps in solving the quadratic equation 5x2 + 27x = 14 − 13x by completing the square are shown.5x2 + 27x = 14 − 13x5x2 + 40x = 145(x2 + 8x) = 14
A
5(x2 + 8x + 16) = 30B
5(x2 + 8x + 16) = 94C
5(x2 + 8x + 4) = 18D
5(x2 + 8x + 4) = 3422
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Mischa wrote the quadratic equation 0=-x2+4x-7 in standard form. If a = -1, what is the value of c in her equation?
A
c=-7B
c=-1C
c=4D
c=723
Between which two ordered pairs does the graph of f(x) = x2 + x – 9 cross the negative x-axis?Quadratic formula: x =
A
(–6, 0) and (–5, 0)B
(–4, 0) and (–3, 0)C
(–3, 0) and (–2, 0)D
(–2, 0) and (–1, 0)Did you find these answers helpful?
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