-0.01x^2+0.7x+6.2=0

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Solution for -0.01x^2+0.7x+6.2=0 equation:


Simplifying
-0.01x2 + 0.7x + 6.2 = 0

Reorder the terms:
6.2 + 0.7x + -0.01x2 = 0

Solving
6.2 + 0.7x + -0.01x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
-620 + -70x + x2 = 0

Move the constant term to the right:

Add '620' to each side of the equation.
-620 + -70x + 620 + x2 = 0 + 620

Reorder the terms:
-620 + 620 + -70x + x2 = 0 + 620

Combine like terms: -620 + 620 = 0
0 + -70x + x2 = 0 + 620
-70x + x2 = 0 + 620

Combine like terms: 0 + 620 = 620
-70x + x2 = 620

The x term is -70x.  Take half its coefficient (-35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
-70x + 1225 + x2 = 620 + 1225

Reorder the terms:
1225 + -70x + x2 = 620 + 1225

Combine like terms: 620 + 1225 = 1845
1225 + -70x + x2 = 1845

Factor a perfect square on the left side:
(x + -35)(x + -35) = 1845

Calculate the square root of the right side: 42.95346319

Break this problem into two subproblems by setting 
(x + -35) equal to 42.95346319 and -42.95346319.

Subproblem 1

x + -35 = 42.95346319 Simplifying x + -35 = 42.95346319 Reorder the terms: -35 + x = 42.95346319 Solving -35 + x = 42.95346319 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + x = 42.95346319 + 35 Combine like terms: -35 + 35 = 0 0 + x = 42.95346319 + 35 x = 42.95346319 + 35 Combine like terms: 42.95346319 + 35 = 77.95346319 x = 77.95346319 Simplifying x = 77.95346319

Subproblem 2

x + -35 = -42.95346319 Simplifying x + -35 = -42.95346319 Reorder the terms: -35 + x = -42.95346319 Solving -35 + x = -42.95346319 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35' to each side of the equation. -35 + 35 + x = -42.95346319 + 35 Combine like terms: -35 + 35 = 0 0 + x = -42.95346319 + 35 x = -42.95346319 + 35 Combine like terms: -42.95346319 + 35 = -7.95346319 x = -7.95346319 Simplifying x = -7.95346319

Solution

The solution to the problem is based on the solutions from the subproblems. x = {77.95346319, -7.95346319}

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