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Solve the quadratic by factoring.

5x^(2)-21 x-5=3x
Answer: 
x=

Solve the quadratic by factoring.\newline5x221x5=3x 5 x^{2}-21 x-5=3 x \newlineAnswer: x= x=

Full solution

Q. Solve the quadratic by factoring.\newline5x221x5=3x 5 x^{2}-21 x-5=3 x \newlineAnswer: x= x=
  1. Move Terms to One Side: Move all terms to one side of the equation to set the equation to zero.\newlineSubtract 3x3x from both sides of the equation 5x221x5=3x5x^2 - 21x - 5 = 3x.\newline5x221x53x=3x3x5x^2 - 21x - 5 - 3x = 3x - 3x\newline5x224x5=05x^2 - 24x - 5 = 0
  2. Identify aa, bb, cc: Identify aa, bb, and cc in the quadratic equation ax2+bx+c=0ax^2 + bx + c = 0. For the equation 5x224x5=05x^2 - 24x - 5 = 0, a=5a = 5, b=24b = -24, and bb00.
  3. Find Two Numbers: Find two numbers that multiply to aca*c (55=255*-5 = -25) and add up to bb (24-24).\newlineThe numbers that satisfy these conditions are 25-25 and 11 because:\newline251=25-25 * 1 = -25 (which is aca*c)\newline25+1=24-25 + 1 = -24 (which is bb)
  4. Split Middle Term: Rewrite the equation by splitting the middle term using the two numbers found in Step 33.\newline5x225x+x5=05x^2 - 25x + x - 5 = 0
  5. Factor by Grouping: Factor by grouping.\newlineGroup the first two terms and the last two terms:\newline(5x225x)+(x5)(5x^2 - 25x) + (x - 5)\newlineFactor out the greatest common factor from each group:\newline5x(x5)+1(x5)5x(x - 5) + 1(x - 5)
  6. Factor Common Binomial: Factor out the common binomial factor.\newlineThe common binomial factor is (x5)(x - 5).\newline5x(x5)+1(x5)=(5x+1)(x5)5x(x - 5) + 1(x - 5) = (5x + 1)(x - 5)
  7. Set Factors Equal: Set each factor equal to zero and solve for xx.\newline5x+1=05x + 1 = 0 and x5=0x - 5 = 0\newlineFor 5x+1=05x + 1 = 0: Subtract 11 from both sides and then divide by 55.\newline5x=15x = -1\newlinex=15x = -\frac{1}{5}\newlineFor x5=0x - 5 = 0: Add 55 to both sides.\newline5x+1=05x + 1 = 000