-4x(2x+3)=20

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Solution for -4x(2x+3)=20 equation:


Simplifying
-4x(2x + 3) = 20

Reorder the terms:
-4x(3 + 2x) = 20
(3 * -4x + 2x * -4x) = 20
(-12x + -8x2) = 20

Solving
-12x + -8x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + -12x + -8x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + -12x + -8x2 = 0

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

Ignore the factor -4.

Subproblem 1

Set the factor '(5 + 3x + 2x2)' equal to zero and attempt to solve: Simplifying 5 + 3x + 2x2 = 0 Solving 5 + 3x + 2x2 = 0 Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 2.5 + 1.5x + x2 = 0 Move the constant term to the right: Add '-2.5' to each side of the equation. 2.5 + 1.5x + -2.5 + x2 = 0 + -2.5 Reorder the terms: 2.5 + -2.5 + 1.5x + x2 = 0 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + 1.5x + x2 = 0 + -2.5 1.5x + x2 = 0 + -2.5 Combine like terms: 0 + -2.5 = -2.5 1.5x + x2 = -2.5 The x term is 1.5x. Take half its coefficient (0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. 1.5x + 0.5625 + x2 = -2.5 + 0.5625 Reorder the terms: 0.5625 + 1.5x + x2 = -2.5 + 0.5625 Combine like terms: -2.5 + 0.5625 = -1.9375 0.5625 + 1.5x + x2 = -1.9375 Factor a perfect square on the left side: (x + 0.75)(x + 0.75) = -1.9375 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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