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x+13x+4=x23x2+7x+41+3x2+7x+41x+\frac{1}{3}x+4=x^2\frac{3x^2+7x+4}{1}+\frac{3x^2+7x+4}{1}

Full solution

Q. x+13x+4=x23x2+7x+41+3x2+7x+41x+\frac{1}{3}x+4=x^2\frac{3x^2+7x+4}{1}+\frac{3x^2+7x+4}{1}
  1. Multiply by LCD: Multiply both sides of the equation by the least common denominator (LCD), which is (3x+4)(3x2+7x+4)(3x + 4)(3x^2 + 7x + 4), to clear the fractions.\newline(x+13x+4)×(3x+4)(3x2+7x+4)=(x2+13x2+7x+4)×(3x+4)(3x2+7x+4)(x + \frac{1}{3x + 4}) \times (3x + 4)(3x^2 + 7x + 4) = \left(\frac{x^2 + 1}{3x^2 + 7x + 4}\right) \times (3x + 4)(3x^2 + 7x + 4)
  2. Simplify after distribution: Simplify both sides of the equation after distributing the LCD. \newlinex(3x+4)(3x2+7x+4)+(3x2+7x+4)=(x2+1)(3x+4)x(3x + 4)(3x^2 + 7x + 4) + (3x^2 + 7x + 4) = (x^2 + 1)(3x + 4)
  3. Distribute xx and simplify: Distribute xx into (3x+4)(3x2+7x+4)(3x + 4)(3x^2 + 7x + 4) and simplify the left side of the equation.\newline3x3+4x2+7x2+28x+16x+3x2+7x+4=(x2+1)(3x+4)3x^3 + 4x^2 + 7x^2 + 28x + 16x + 3x^2 + 7x + 4 = (x^2 + 1)(3x + 4)
  4. Combine like terms: Combine like terms on the left side of the equation.\newline3x3+14x2+51x+4=(x2+1)(3x+4)3x^3 + 14x^2 + 51x + 4 = (x^2 + 1)(3x + 4)
  5. Distribute and simplify: Distribute (x2+1)(x^2 + 1) into (3x+4)(3x + 4) on the right side of the equation.\newline3x3+14x2+51x+4=3x3+4x2+3x+43x^3 + 14x^2 + 51x + 4 = 3x^3 + 4x^2 + 3x + 4
  6. Subtract and set to zero: Subtract 3x33x^3, 4x24x^2, 3x3x, and 44 from both sides of the equation to get all terms on one side and set the equation to zero.\newline3x3+14x2+51x+4(3x3+4x2+3x+4)=03x^3 + 14x^2 + 51x + 4 - (3x^3 + 4x^2 + 3x + 4) = 0
  7. Combine like terms: Combine like terms after subtraction.\newline14x2+51x+44x23x4=014x^2 + 51x + 4 - 4x^2 - 3x - 4 = 0\newline10x2+48x=010x^2 + 48x = 0