3x(5-2x)-20=-8

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Solution for 3x(5-2x)-20=-8 equation:


Simplifying
3x(5 + -2x) + -20 = -8
(5 * 3x + -2x * 3x) + -20 = -8
(15x + -6x2) + -20 = -8

Reorder the terms:
-20 + 15x + -6x2 = -8

Solving
-20 + 15x + -6x2 = -8

Solving for variable 'x'.

Reorder the terms:
-20 + 8 + 15x + -6x2 = -8 + 8

Combine like terms: -20 + 8 = -12
-12 + 15x + -6x2 = -8 + 8

Combine like terms: -8 + 8 = 0
-12 + 15x + -6x2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-4 + 5x + -2x2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-4 + 5x + -2x2)' equal to zero and attempt to solve: Simplifying -4 + 5x + -2x2 = 0 Solving -4 + 5x + -2x2 = 0 Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. 2 + -2.5x + x2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + -2.5x + -2 + x2 = 0 + -2 Reorder the terms: 2 + -2 + -2.5x + x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -2.5x + x2 = 0 + -2 -2.5x + x2 = 0 + -2 Combine like terms: 0 + -2 = -2 -2.5x + x2 = -2 The x term is -2.5x. Take half its coefficient (-1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. -2.5x + 1.5625 + x2 = -2 + 1.5625 Reorder the terms: 1.5625 + -2.5x + x2 = -2 + 1.5625 Combine like terms: -2 + 1.5625 = -0.4375 1.5625 + -2.5x + x2 = -0.4375 Factor a perfect square on the left side: (x + -1.25)(x + -1.25) = -0.4375 Can't calculate square root of the right side. The solution to this equation could not be determined. This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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