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19 December, 22:10

The question is - x^2+18x-75.

I know that first you need to find the axis of symmetry but I am not sure how to use the formula - b/2a in this equation?

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  1. 19 December, 22:18
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    When you use - b/2a you plug in a and b. in this case it would be - 18/-2 which coms out as 9. then you plug 9 into x. - 9^2+18 (9) - 75 which comes out as - 12. Your vertex is (9,-12) your Axis of semmetry would be 9.
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