4x(3x-5)=7(2x+3)

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


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

Reorder the terms:
4x(-5 + 3x) = 7(2x + 3)
(-5 * 4x + 3x * 4x) = 7(2x + 3)
(-20x + 12x2) = 7(2x + 3)

Reorder the terms:
-20x + 12x2 = 7(3 + 2x)
-20x + 12x2 = (3 * 7 + 2x * 7)
-20x + 12x2 = (21 + 14x)

Solving
-20x + 12x2 = 21 + 14x

Solving for variable 'x'.

Reorder the terms:
-21 + -20x + -14x + 12x2 = 21 + 14x + -21 + -14x

Combine like terms: -20x + -14x = -34x
-21 + -34x + 12x2 = 21 + 14x + -21 + -14x

Reorder the terms:
-21 + -34x + 12x2 = 21 + -21 + 14x + -14x

Combine like terms: 21 + -21 = 0
-21 + -34x + 12x2 = 0 + 14x + -14x
-21 + -34x + 12x2 = 14x + -14x

Combine like terms: 14x + -14x = 0
-21 + -34x + 12x2 = 0

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

Divide each side by '12'.
-1.75 + -2.833333333x + x2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + -2.833333333x + 1.75 + x2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + -2.833333333x + x2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + -2.833333333x + x2 = 0 + 1.75
-2.833333333x + x2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
-2.833333333x + x2 = 1.75

The x term is -2.833333333x.  Take half its coefficient (-1.416666667).
Square it (2.006944445) and add it to both sides.

Add '2.006944445' to each side of the equation.
-2.833333333x + 2.006944445 + x2 = 1.75 + 2.006944445

Reorder the terms:
2.006944445 + -2.833333333x + x2 = 1.75 + 2.006944445

Combine like terms: 1.75 + 2.006944445 = 3.756944445
2.006944445 + -2.833333333x + x2 = 3.756944445

Factor a perfect square on the left side:
(x + -1.416666667)(x + -1.416666667) = 3.756944445

Calculate the square root of the right side: 1.938283892

Break this problem into two subproblems by setting 
(x + -1.416666667) equal to 1.938283892 and -1.938283892.

Subproblem 1

x + -1.416666667 = 1.938283892 Simplifying x + -1.416666667 = 1.938283892 Reorder the terms: -1.416666667 + x = 1.938283892 Solving -1.416666667 + x = 1.938283892 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.416666667' to each side of the equation. -1.416666667 + 1.416666667 + x = 1.938283892 + 1.416666667 Combine like terms: -1.416666667 + 1.416666667 = 0.000000000 0.000000000 + x = 1.938283892 + 1.416666667 x = 1.938283892 + 1.416666667 Combine like terms: 1.938283892 + 1.416666667 = 3.354950559 x = 3.354950559 Simplifying x = 3.354950559

Subproblem 2

x + -1.416666667 = -1.938283892 Simplifying x + -1.416666667 = -1.938283892 Reorder the terms: -1.416666667 + x = -1.938283892 Solving -1.416666667 + x = -1.938283892 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.416666667' to each side of the equation. -1.416666667 + 1.416666667 + x = -1.938283892 + 1.416666667 Combine like terms: -1.416666667 + 1.416666667 = 0.000000000 0.000000000 + x = -1.938283892 + 1.416666667 x = -1.938283892 + 1.416666667 Combine like terms: -1.938283892 + 1.416666667 = -0.521617225 x = -0.521617225 Simplifying x = -0.521617225

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.354950559, -0.521617225}

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