Asked by Lily
Put the quadratics below into vertex form by completing the square. state the vertex.
a) y=x^2 - 4x-21
a) y=x^2 - 4x-21
Answers
Answered by
Reiny
y=x^2 - 4x-21
= (x^2 - 4x + 4 - 4) - 21
= ( (x-2)^2 - 4) - 21
= (x-2)^2 - 4 - 21
= (x-2)^2 - 25
take over
= (x^2 - 4x + 4 - 4) - 21
= ( (x-2)^2 - 4) - 21
= (x-2)^2 - 4 - 21
= (x-2)^2 - 25
take over
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