what is the line of symmetry of y=9x^2-180x+907

Answer choices:  x=4, x=-4, x=-3, x=3
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9x^2-180x+907=9(x^2-20x)+907=9(x^2-20x+100)+907-900=9(x-10)^2+7. The line of symmetry is therefore x=10, none of the options given. (The options correspond to ±54x or ±72x as the x term.)

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