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

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03-05-2017
Mathematics

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

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apologiabiology apologiabiology · Answer 1 · 2017-05-03T00:13:57+02:00

apologiabiology apologiabiology

03-05-2017

expand
-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

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