The polynomial p(x)=x^3+3x^2-4 has a known factor of (x-1)

your answer is

Factors: (x-1)(x+2)(x+2)

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it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: