-5x(x+4)=25

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Solution for -5x(x+4)=25 equation:


Simplifying
-5x(x + 4) = 25

Reorder the terms:
-5x(4 + x) = 25
(4 * -5x + x * -5x) = 25
(-20x + -5x2) = 25

Solving
-20x + -5x2 = 25

Solving for variable 'x'.

Reorder the terms:
-25 + -20x + -5x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + -20x + -5x2 = 0

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

Ignore the factor -5.

Subproblem 1

Set the factor '(5 + 4x + x2)' equal to zero and attempt to solve: Simplifying 5 + 4x + x2 = 0 Solving 5 + 4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-5' to each side of the equation. 5 + 4x + -5 + x2 = 0 + -5 Reorder the terms: 5 + -5 + 4x + x2 = 0 + -5 Combine like terms: 5 + -5 = 0 0 + 4x + x2 = 0 + -5 4x + x2 = 0 + -5 Combine like terms: 0 + -5 = -5 4x + x2 = -5 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = -5 + 4 Reorder the terms: 4 + 4x + x2 = -5 + 4 Combine like terms: -5 + 4 = -1 4 + 4x + x2 = -1 Factor a perfect square on the left side: (x + 2)(x + 2) = -1 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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