5x^2=70+7x

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Solution for 5x^2=70+7x equation:


Simplifying
5x2 = 70 + 7x

Solving
5x2 = 70 + 7x

Solving for variable 'x'.

Reorder the terms:
-70 + -7x + 5x2 = 70 + 7x + -70 + -7x

Reorder the terms:
-70 + -7x + 5x2 = 70 + -70 + 7x + -7x

Combine like terms: 70 + -70 = 0
-70 + -7x + 5x2 = 0 + 7x + -7x
-70 + -7x + 5x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-70 + -7x + 5x2 = 0

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

Divide each side by '5'.
-14 + -1.4x + x2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -1.4x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + -1.4x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -1.4x + x2 = 0 + 14
-1.4x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
-1.4x + x2 = 14

The x term is -1.4x.  Take half its coefficient (-0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
-1.4x + 0.49 + x2 = 14 + 0.49

Reorder the terms:
0.49 + -1.4x + x2 = 14 + 0.49

Combine like terms: 14 + 0.49 = 14.49
0.49 + -1.4x + x2 = 14.49

Factor a perfect square on the left side:
(x + -0.7)(x + -0.7) = 14.49

Calculate the square root of the right side: 3.806573262

Break this problem into two subproblems by setting 
(x + -0.7) equal to 3.806573262 and -3.806573262.

Subproblem 1

x + -0.7 = 3.806573262 Simplifying x + -0.7 = 3.806573262 Reorder the terms: -0.7 + x = 3.806573262 Solving -0.7 + x = 3.806573262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 3.806573262 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 3.806573262 + 0.7 x = 3.806573262 + 0.7 Combine like terms: 3.806573262 + 0.7 = 4.506573262 x = 4.506573262 Simplifying x = 4.506573262

Subproblem 2

x + -0.7 = -3.806573262 Simplifying x + -0.7 = -3.806573262 Reorder the terms: -0.7 + x = -3.806573262 Solving -0.7 + x = -3.806573262 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -3.806573262 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -3.806573262 + 0.7 x = -3.806573262 + 0.7 Combine like terms: -3.806573262 + 0.7 = -3.106573262 x = -3.106573262 Simplifying x = -3.106573262

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.506573262, -3.106573262}

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