Which of the following shows the equation y = x2 + 8x + 14 in vertex form? a. y = (x+4)2  -28 b. y = (x+4)2 -2 c. y = (x-8)2  + 14 d. y = (x+8)2 + 14

Y=x²+8x+14
to make a square, if a is 1, add (half of b)²
in this case, a=1, b=8, half of 8 is 4
y=x²+8x+4²-4²+14
y=(x+4)²-16+14
y=(x+4)²-2
B is the answer.

another way to do it:
the vertex is at x=-b/2a=-8/2*1=-4
when x=-4, y=(-4)²+8(-4)+14=-2
so the equation is y=[x-(-4)]²-2, which is y=(x+4)²-2, the same answer B

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