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umka21 [38]
3 years ago
15

Vertex form of y=x^2-4x-9

Mathematics
1 answer:
Scrat [10]3 years ago
3 0
Complete the square
first isolate x terms
y=(x^2-4x)-9
complete square inside (take 1/2 of square of b )
-4/2=-2, (-2)^2=4
add 4-4 inside
y=(x^2-4x+4-4)-9
complete the square
y=((x-2)^2-4)-9
y=(x-2)^2-4-9
y=(x-2)^2-13
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