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

2 answers:

8 0

Answer:

The y-axis is the correct answer.

4 0

Answer:

The axis of symmetry is x=6

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kap26 [50]

Setting $x=6$ , $y=7.9(1.02)^6 \approx \boxed{8.9}$

Setting $x=14$ , $y=7.9(1.02)^{14} \approx \boxed{10.4}$

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