3.5x^2-3.5x-70=0

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Solution for 3.5x^2-3.5x-70=0 equation:


Simplifying
3.5x2 + -3.5x + -70 = 0

Reorder the terms:
-70 + -3.5x + 3.5x2 = 0

Solving
-70 + -3.5x + 3.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '3.5'.
-20 + -1x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -1x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -1x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -1x + x2 = 0 + 20
-1x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-1x + x2 = 20

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 20 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 20 + 0.25

Combine like terms: 20 + 0.25 = 20.25
0.25 + -1x + x2 = 20.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 20.25

Calculate the square root of the right side: 4.5

Break this problem into two subproblems by setting 
(x + -0.5) equal to 4.5 and -4.5.

Subproblem 1

x + -0.5 = 4.5 Simplifying x + -0.5 = 4.5 Reorder the terms: -0.5 + x = 4.5 Solving -0.5 + x = 4.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 4.5 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 4.5 + 0.5 x = 4.5 + 0.5 Combine like terms: 4.5 + 0.5 = 5 x = 5 Simplifying x = 5

Subproblem 2

x + -0.5 = -4.5 Simplifying x + -0.5 = -4.5 Reorder the terms: -0.5 + x = -4.5 Solving -0.5 + x = -4.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -4.5 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -4.5 + 0.5 x = -4.5 + 0.5 Combine like terms: -4.5 + 0.5 = -4 x = -4 Simplifying x = -4

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5, -4}

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