Asked by Amy Harold
y=x^2+bx+7 has a vertex at (-4,-9). What is the value of b?
Answers
Answered by
Steve
well, plug in your point!
(-4)^2+b(-4)+7 = -9
16-4b+7 = -9
-4b = -32
b = 8
check:
x^2+8x+7 = (x+4)^2-9
(-4)^2+b(-4)+7 = -9
16-4b+7 = -9
-4b = -32
b = 8
check:
x^2+8x+7 = (x+4)^2-9
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