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Factorize the quadratic expression: f(x)=3x^(3)-21x^(2)-54 x

Factorize the quadratic expression: f(x)=3x321x254xf(x)=3x^{3}-21x^{2}-54x

Full solution

Q. Factorize the quadratic expression: f(x)=3x321x254xf(x)=3x^{3}-21x^{2}-54x
  1. Identify Common Factor: Identify the common factor in the terms of f(x)f(x).f(x)=3x321x254xf(x) = 3x^3 - 21x^2 - 54xCommon factor = 3x3x
  2. Factor Out Common Factor: Factor out the common factor from each term.\newlinef(x)=3x(x27x18)f(x) = 3x(x^2 - 7x - 18)
  3. Factorize Quadratic Expression: Factorize the quadratic expression inside the parentheses.\newlinex27x18x^2 - 7x - 18\newlineFactors of 18-18 that add up to 7-7 are 9-9 and +2+2.\newline(x9)(x+2)(x - 9)(x + 2)
  4. Write Fully Factored Form: Write the fully factored form of f(x)f(x).f(x)=3x(x9)(x+2)f(x) = 3x(x - 9)(x + 2)

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