What is the axis of symmetry of the function of -(x+9)(x-21)

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asked Oct 2, 2018 142k views

1 Answer

LennonR · Answer 1 · 2018-10-06T18:40:50+0000

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-x^2+12x+189

now
the axis of symmetry is -b/2a for ax^2+bx+c

so

-1x^2+12x+189
a=-1
b=12

-b/2a=-12/(2*-1)=-12/-2=6
the axis of summetry is x=6

What is the axis of symmetry of the function of -(x+9)(x-21)

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