4x^2+16x-64=49

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Solution for 4x^2+16x-64=49 equation:


Simplifying
4x2 + 16x + -64 = 49

Reorder the terms:
-64 + 16x + 4x2 = 49

Solving
-64 + 16x + 4x2 = 49

Solving for variable 'x'.

Reorder the terms:
-64 + -49 + 16x + 4x2 = 49 + -49

Combine like terms: -64 + -49 = -113
-113 + 16x + 4x2 = 49 + -49

Combine like terms: 49 + -49 = 0
-113 + 16x + 4x2 = 0

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

Divide each side by '4'.
-28.25 + 4x + x2 = 0

Move the constant term to the right:

Add '28.25' to each side of the equation.
-28.25 + 4x + 28.25 + x2 = 0 + 28.25

Reorder the terms:
-28.25 + 28.25 + 4x + x2 = 0 + 28.25

Combine like terms: -28.25 + 28.25 = 0.00
0.00 + 4x + x2 = 0 + 28.25
4x + x2 = 0 + 28.25

Combine like terms: 0 + 28.25 = 28.25
4x + x2 = 28.25

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 28.25 + 4

Reorder the terms:
4 + 4x + x2 = 28.25 + 4

Combine like terms: 28.25 + 4 = 32.25
4 + 4x + x2 = 32.25

Factor a perfect square on the left side:
(x + 2)(x + 2) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(x + 2) equal to 5.678908346 and -5.678908346.

Subproblem 1

x + 2 = 5.678908346 Simplifying x + 2 = 5.678908346 Reorder the terms: 2 + x = 5.678908346 Solving 2 + x = 5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 5.678908346 + -2 Combine like terms: 2 + -2 = 0 0 + x = 5.678908346 + -2 x = 5.678908346 + -2 Combine like terms: 5.678908346 + -2 = 3.678908346 x = 3.678908346 Simplifying x = 3.678908346

Subproblem 2

x + 2 = -5.678908346 Simplifying x + 2 = -5.678908346 Reorder the terms: 2 + x = -5.678908346 Solving 2 + x = -5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -5.678908346 + -2 Combine like terms: 2 + -2 = 0 0 + x = -5.678908346 + -2 x = -5.678908346 + -2 Combine like terms: -5.678908346 + -2 = -7.678908346 x = -7.678908346 Simplifying x = -7.678908346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.678908346, -7.678908346}

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