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Q.

The vertex of the parabola y=ax2+bx+c is

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a

-b2a,b2-4ac4a

b

-b2a,4ac-b24a

c

b2a,b2-4ac4a

d

b2a,4ac-b24a

answer is D.

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Detailed Solution

y=ax2+bx+c ax2+bx=y-c a(x2+bax)=y-c a(x2+2b2ax+b24a2-b24a2)=y-c a(x+b2a)2=y-c+b24a (x+b2a)2=1a(y-(4ac-b24a))

Vertex=-b2a, 4ac-b24a

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