(-x)*(-x)+4x-21=-4x+x*x+21

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Solution for (-x)*(-x)+4x-21=-4x+x*x+21 equation:


Simplifying
(-1x)(-1x) + 4x + -21 = -4x + x * x + 21

Remove parenthesis around (-1x)
-1x(-1x) + 4x + -21 = -4x + x * x + 21

Remove parenthesis around (-1x)
-1x * -1x + 4x + -21 = -4x + x * x + 21

Reorder the terms for easier multiplication:
-1 * -1x * x + 4x + -21 = -4x + x * x + 21

Multiply -1 * -1
1x * x + 4x + -21 = -4x + x * x + 21

Multiply x * x
1x2 + 4x + -21 = -4x + x * x + 21

Reorder the terms:
-21 + 4x + 1x2 = -4x + x * x + 21

Multiply x * x
-21 + 4x + 1x2 = -4x + x2 + 21

Reorder the terms:
-21 + 4x + 1x2 = 21 + -4x + x2

Solving
-21 + 4x + 1x2 = 21 + -4x + x2

Solving for variable 'x'.

Reorder the terms:
-21 + -21 + 4x + 4x + 1x2 + -1x2 = 21 + -4x + x2 + -21 + 4x + -1x2

Combine like terms: -21 + -21 = -42
-42 + 4x + 4x + 1x2 + -1x2 = 21 + -4x + x2 + -21 + 4x + -1x2

Combine like terms: 4x + 4x = 8x
-42 + 8x + 1x2 + -1x2 = 21 + -4x + x2 + -21 + 4x + -1x2

Combine like terms: 1x2 + -1x2 = 0
-42 + 8x + 0 = 21 + -4x + x2 + -21 + 4x + -1x2
-42 + 8x = 21 + -4x + x2 + -21 + 4x + -1x2

Reorder the terms:
-42 + 8x = 21 + -21 + -4x + 4x + x2 + -1x2

Combine like terms: 21 + -21 = 0
-42 + 8x = 0 + -4x + 4x + x2 + -1x2
-42 + 8x = -4x + 4x + x2 + -1x2

Combine like terms: -4x + 4x = 0
-42 + 8x = 0 + x2 + -1x2
-42 + 8x = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-42 + 8x = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-21 + 4x) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-21 + 4x)' equal to zero and attempt to solve: Simplifying -21 + 4x = 0 Solving -21 + 4x = 0 Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 4x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 4x = 0 + 21 4x = 0 + 21 Combine like terms: 0 + 21 = 21 4x = 21 Divide each side by '4'. x = 5.25 Simplifying x = 5.25

Solution

x = {5.25}

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