Complete the square to re-write the quadratic function in vertex form:
y = x2 + 4x – 9
2 answers:
Answer: −
2
±
√
13
Step-by-step explanation:
(-b±√(b²-4ac))/(2a)
Plug in and solve.
Answer:
y = (x + 2)² - 13
Step-by-step explanation:
y = x² + 4x - 9
To complete the square
add/ subtract ( half the coefficient of the x- term)² to x² + 4x
y = x² + 2(2)x + 4 - 4 - 9
= (x + 2)² - 13 ← in vertex form
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