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Solve the equation by factoring:

51x^(2)-210 x-3x^(3)=0
Answer: 
x=

Solve the equation by factoring:\newline51x2210x3x3=0 51 x^{2}-210 x-3 x^{3}=0 \newlineAnswer: x= x=

Full solution

Q. Solve the equation by factoring:\newline51x2210x3x3=0 51 x^{2}-210 x-3 x^{3}=0 \newlineAnswer: x= x=
  1. Rearrange Equation: First, we need to rearrange the terms of the equation in descending order of the powers of xx. Rearrange the equation: 3x3+51x2210x=0-3x^3 + 51x^2 - 210x = 0
  2. Factor Common Factor: Next, we factor out the greatest common factor, which is xx in this case.\newlineFactor out xx: x(3x2+51x210)=0x(-3x^2 + 51x - 210) = 0
  3. Factor Quadratic Expression: Now, we need to factor the quadratic expression inside the parentheses.\newlineWe look for two numbers that multiply to 3×210-3 \times -210 (which is 630630) and add up to 5151.\newlineThe numbers that satisfy these conditions are 6363 and 10-10.\newlineFactor the quadratic: x(3x2+63x10x210)=0x(-3x^2 + 63x - 10x - 210) = 0
  4. Group Terms for Factoring: We can now group the terms to factor by grouping.\newlineGroup the terms: x((3x2+63x)(10x+210))=0x((-3x^2 + 63x) - (10x + 210)) = 0
  5. Factor Common Factors: Factor out the common factors from each group.\newlineFactor the first group by 3x3x and the second by 1010: x(3x(x+21)10(x+21))=0x(3x(-x + 21) - 10(-x + 21)) = 0
  6. Factor Out Common Factor: We notice that x+21 -x + 21 is a common factor, so we factor it out.\newlineFactor out x+21 -x + 21 : x(x+21)(3x10)=0 x(-x + 21)(3x - 10) = 0
  7. Set Factors Equal to Zero: Now we have the equation in factored form, we can find the solutions by setting each factor equal to zero.\newlineSet each factor equal to zero: x=0x = 0, x+21=0-x + 21 = 0, 3x10=03x - 10 = 0
  8. Solve for x: Solve each equation for x.\newlineFor x=0x = 0, we already have the solution: x=0x = 0.\newlineFor x+21=0-x + 21 = 0, add xx to both sides and subtract 2121: x=21x = 21.\newlineFor 3x10=03x - 10 = 0, add 1010 to both sides and divide by 33: x=103x = \frac{10}{3}.

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