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g(x) = x^2 - 2x: Find g(9)

2 answers

wherever you have an x, put in 9

g(x) = x^2 - 2x
g(9) = 9^2 - 2*9 = ......
g(9) = 9^2 - 2*9 =
multiply the numbers:2*9=18 so
g(9)=9^2-18
9^2=81 so
g(9) =81-18
subtract the numbers: 81-18=63 so
g(9) = 63
divide both sides by 9 g(9)/9 = 63/9 so
g = 7
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