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sergiy2304 [10]
4 years ago
12

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

Mathematics
1 answer:
DaniilM [7]4 years ago
5 0
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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