2x^2+14x+49=100

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Solution for 2x^2+14x+49=100 equation:


Simplifying
2x2 + 14x + 49 = 100

Reorder the terms:
49 + 14x + 2x2 = 100

Solving
49 + 14x + 2x2 = 100

Solving for variable 'x'.

Reorder the terms:
49 + -100 + 14x + 2x2 = 100 + -100

Combine like terms: 49 + -100 = -51
-51 + 14x + 2x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-51 + 14x + 2x2 = 0

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

Divide each side by '2'.
-25.5 + 7x + x2 = 0

Move the constant term to the right:

Add '25.5' to each side of the equation.
-25.5 + 7x + 25.5 + x2 = 0 + 25.5

Reorder the terms:
-25.5 + 25.5 + 7x + x2 = 0 + 25.5

Combine like terms: -25.5 + 25.5 = 0.0
0.0 + 7x + x2 = 0 + 25.5
7x + x2 = 0 + 25.5

Combine like terms: 0 + 25.5 = 25.5
7x + x2 = 25.5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 25.5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 25.5 + 12.25

Combine like terms: 25.5 + 12.25 = 37.75
12.25 + 7x + x2 = 37.75

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 37.75

Calculate the square root of the right side: 6.144102864

Break this problem into two subproblems by setting 
(x + 3.5) equal to 6.144102864 and -6.144102864.

Subproblem 1

x + 3.5 = 6.144102864 Simplifying x + 3.5 = 6.144102864 Reorder the terms: 3.5 + x = 6.144102864 Solving 3.5 + x = 6.144102864 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 6.144102864 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 6.144102864 + -3.5 x = 6.144102864 + -3.5 Combine like terms: 6.144102864 + -3.5 = 2.644102864 x = 2.644102864 Simplifying x = 2.644102864

Subproblem 2

x + 3.5 = -6.144102864 Simplifying x + 3.5 = -6.144102864 Reorder the terms: 3.5 + x = -6.144102864 Solving 3.5 + x = -6.144102864 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -6.144102864 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -6.144102864 + -3.5 x = -6.144102864 + -3.5 Combine like terms: -6.144102864 + -3.5 = -9.644102864 x = -9.644102864 Simplifying x = -9.644102864

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.644102864, -9.644102864}

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