(4x+3)(4x+3)=72

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Solution for (4x+3)(4x+3)=72 equation:


Simplifying
(4x + 3)(4x + 3) = 72

Reorder the terms:
(3 + 4x)(4x + 3) = 72

Reorder the terms:
(3 + 4x)(3 + 4x) = 72

Multiply (3 + 4x) * (3 + 4x)
(3(3 + 4x) + 4x * (3 + 4x)) = 72
((3 * 3 + 4x * 3) + 4x * (3 + 4x)) = 72
((9 + 12x) + 4x * (3 + 4x)) = 72
(9 + 12x + (3 * 4x + 4x * 4x)) = 72
(9 + 12x + (12x + 16x2)) = 72

Combine like terms: 12x + 12x = 24x
(9 + 24x + 16x2) = 72

Solving
9 + 24x + 16x2 = 72

Solving for variable 'x'.

Reorder the terms:
9 + -72 + 24x + 16x2 = 72 + -72

Combine like terms: 9 + -72 = -63
-63 + 24x + 16x2 = 72 + -72

Combine like terms: 72 + -72 = 0
-63 + 24x + 16x2 = 0

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

Divide each side by '16'.
-3.9375 + 1.5x + x2 = 0

Move the constant term to the right:

Add '3.9375' to each side of the equation.
-3.9375 + 1.5x + 3.9375 + x2 = 0 + 3.9375

Reorder the terms:
-3.9375 + 3.9375 + 1.5x + x2 = 0 + 3.9375

Combine like terms: -3.9375 + 3.9375 = 0.0000
0.0000 + 1.5x + x2 = 0 + 3.9375
1.5x + x2 = 0 + 3.9375

Combine like terms: 0 + 3.9375 = 3.9375
1.5x + x2 = 3.9375

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 3.9375 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 3.9375 + 0.5625

Combine like terms: 3.9375 + 0.5625 = 4.5
0.5625 + 1.5x + x2 = 4.5

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.121320344 and -2.121320344.

Subproblem 1

x + 0.75 = 2.121320344 Simplifying x + 0.75 = 2.121320344 Reorder the terms: 0.75 + x = 2.121320344 Solving 0.75 + x = 2.121320344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.121320344 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.121320344 + -0.75 x = 2.121320344 + -0.75 Combine like terms: 2.121320344 + -0.75 = 1.371320344 x = 1.371320344 Simplifying x = 1.371320344

Subproblem 2

x + 0.75 = -2.121320344 Simplifying x + 0.75 = -2.121320344 Reorder the terms: 0.75 + x = -2.121320344 Solving 0.75 + x = -2.121320344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.121320344 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.121320344 + -0.75 x = -2.121320344 + -0.75 Combine like terms: -2.121320344 + -0.75 = -2.871320344 x = -2.871320344 Simplifying x = -2.871320344

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.371320344, -2.871320344}

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