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18-06-2020
Mathematics

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Solve x^2-8x-9=0 algebrically

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18-06-2020

Answer:

x=9 x=-1

Step-by-step explanation:

x^2-8x-9=0

Factor

What 2 numbers multiply to -9 and add to -8

(x-9) (x+1) =0

Using the zero product property

x-9 =0 x+1 =0

x=9 x=-1

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