deduran
15.01.2020 •
Mathematics
What is the axis of symmetry of the function of -(x+9)(x-21)
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Ответ:
-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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