5(x^2-9x)-2(3x+4)+7=0

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Solution for 5(x^2-9x)-2(3x+4)+7=0 equation:


Simplifying
5(x2 + -9x) + -2(3x + 4) + 7 = 0

Reorder the terms:
5(-9x + x2) + -2(3x + 4) + 7 = 0
(-9x * 5 + x2 * 5) + -2(3x + 4) + 7 = 0
(-45x + 5x2) + -2(3x + 4) + 7 = 0

Reorder the terms:
-45x + 5x2 + -2(4 + 3x) + 7 = 0
-45x + 5x2 + (4 * -2 + 3x * -2) + 7 = 0
-45x + 5x2 + (-8 + -6x) + 7 = 0

Reorder the terms:
-8 + 7 + -45x + -6x + 5x2 = 0

Combine like terms: -8 + 7 = -1
-1 + -45x + -6x + 5x2 = 0

Combine like terms: -45x + -6x = -51x
-1 + -51x + 5x2 = 0

Solving
-1 + -51x + 5x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-0.2 + -10.2x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -10.2x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -10.2x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -10.2x + x2 = 0 + 0.2
-10.2x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-10.2x + x2 = 0.2

The x term is -10.2x.  Take half its coefficient (-5.1).
Square it (26.01) and add it to both sides.

Add '26.01' to each side of the equation.
-10.2x + 26.01 + x2 = 0.2 + 26.01

Reorder the terms:
26.01 + -10.2x + x2 = 0.2 + 26.01

Combine like terms: 0.2 + 26.01 = 26.21
26.01 + -10.2x + x2 = 26.21

Factor a perfect square on the left side:
(x + -5.1)(x + -5.1) = 26.21

Calculate the square root of the right side: 5.119570294

Break this problem into two subproblems by setting 
(x + -5.1) equal to 5.119570294 and -5.119570294.

Subproblem 1

x + -5.1 = 5.119570294 Simplifying x + -5.1 = 5.119570294 Reorder the terms: -5.1 + x = 5.119570294 Solving -5.1 + x = 5.119570294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.1' to each side of the equation. -5.1 + 5.1 + x = 5.119570294 + 5.1 Combine like terms: -5.1 + 5.1 = 0.0 0.0 + x = 5.119570294 + 5.1 x = 5.119570294 + 5.1 Combine like terms: 5.119570294 + 5.1 = 10.219570294 x = 10.219570294 Simplifying x = 10.219570294

Subproblem 2

x + -5.1 = -5.119570294 Simplifying x + -5.1 = -5.119570294 Reorder the terms: -5.1 + x = -5.119570294 Solving -5.1 + x = -5.119570294 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.1' to each side of the equation. -5.1 + 5.1 + x = -5.119570294 + 5.1 Combine like terms: -5.1 + 5.1 = 0.0 0.0 + x = -5.119570294 + 5.1 x = -5.119570294 + 5.1 Combine like terms: -5.119570294 + 5.1 = -0.019570294 x = -0.019570294 Simplifying x = -0.019570294

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.219570294, -0.019570294}

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