(4x+5)(x-3)=720

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Solution for (4x+5)(x-3)=720 equation:


Simplifying
(4x + 5)(x + -3) = 720

Reorder the terms:
(5 + 4x)(x + -3) = 720

Reorder the terms:
(5 + 4x)(-3 + x) = 720

Multiply (5 + 4x) * (-3 + x)
(5(-3 + x) + 4x * (-3 + x)) = 720
((-3 * 5 + x * 5) + 4x * (-3 + x)) = 720
((-15 + 5x) + 4x * (-3 + x)) = 720
(-15 + 5x + (-3 * 4x + x * 4x)) = 720
(-15 + 5x + (-12x + 4x2)) = 720

Combine like terms: 5x + -12x = -7x
(-15 + -7x + 4x2) = 720

Solving
-15 + -7x + 4x2 = 720

Solving for variable 'x'.

Reorder the terms:
-15 + -720 + -7x + 4x2 = 720 + -720

Combine like terms: -15 + -720 = -735
-735 + -7x + 4x2 = 720 + -720

Combine like terms: 720 + -720 = 0
-735 + -7x + 4x2 = 0

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

Divide each side by '4'.
-183.75 + -1.75x + x2 = 0

Move the constant term to the right:

Add '183.75' to each side of the equation.
-183.75 + -1.75x + 183.75 + x2 = 0 + 183.75

Reorder the terms:
-183.75 + 183.75 + -1.75x + x2 = 0 + 183.75

Combine like terms: -183.75 + 183.75 = 0.00
0.00 + -1.75x + x2 = 0 + 183.75
-1.75x + x2 = 0 + 183.75

Combine like terms: 0 + 183.75 = 183.75
-1.75x + x2 = 183.75

The x term is -1.75x.  Take half its coefficient (-0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
-1.75x + 0.765625 + x2 = 183.75 + 0.765625

Reorder the terms:
0.765625 + -1.75x + x2 = 183.75 + 0.765625

Combine like terms: 183.75 + 0.765625 = 184.515625
0.765625 + -1.75x + x2 = 184.515625

Factor a perfect square on the left side:
(x + -0.875)(x + -0.875) = 184.515625

Calculate the square root of the right side: 13.583652859

Break this problem into two subproblems by setting 
(x + -0.875) equal to 13.583652859 and -13.583652859.

Subproblem 1

x + -0.875 = 13.583652859 Simplifying x + -0.875 = 13.583652859 Reorder the terms: -0.875 + x = 13.583652859 Solving -0.875 + x = 13.583652859 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = 13.583652859 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = 13.583652859 + 0.875 x = 13.583652859 + 0.875 Combine like terms: 13.583652859 + 0.875 = 14.458652859 x = 14.458652859 Simplifying x = 14.458652859

Subproblem 2

x + -0.875 = -13.583652859 Simplifying x + -0.875 = -13.583652859 Reorder the terms: -0.875 + x = -13.583652859 Solving -0.875 + x = -13.583652859 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.875' to each side of the equation. -0.875 + 0.875 + x = -13.583652859 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + x = -13.583652859 + 0.875 x = -13.583652859 + 0.875 Combine like terms: -13.583652859 + 0.875 = -12.708652859 x = -12.708652859 Simplifying x = -12.708652859

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.458652859, -12.708652859}

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