5a*a-26a+15=

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Solution for 5a*a-26a+15= equation:


Simplifying
5a * a + -26a + 15 = 0

Multiply a * a
5a2 + -26a + 15 = 0

Reorder the terms:
15 + -26a + 5a2 = 0

Solving
15 + -26a + 5a2 = 0

Solving for variable 'a'.

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

Divide each side by '5'.
3 + -5.2a + a2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -5.2a + -3 + a2 = 0 + -3

Reorder the terms:
3 + -3 + -5.2a + a2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -5.2a + a2 = 0 + -3
-5.2a + a2 = 0 + -3

Combine like terms: 0 + -3 = -3
-5.2a + a2 = -3

The a term is -5.2a.  Take half its coefficient (-2.6).
Square it (6.76) and add it to both sides.

Add '6.76' to each side of the equation.
-5.2a + 6.76 + a2 = -3 + 6.76

Reorder the terms:
6.76 + -5.2a + a2 = -3 + 6.76

Combine like terms: -3 + 6.76 = 3.76
6.76 + -5.2a + a2 = 3.76

Factor a perfect square on the left side:
(a + -2.6)(a + -2.6) = 3.76

Calculate the square root of the right side: 1.939071943

Break this problem into two subproblems by setting 
(a + -2.6) equal to 1.939071943 and -1.939071943.

Subproblem 1

a + -2.6 = 1.939071943 Simplifying a + -2.6 = 1.939071943 Reorder the terms: -2.6 + a = 1.939071943 Solving -2.6 + a = 1.939071943 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + a = 1.939071943 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + a = 1.939071943 + 2.6 a = 1.939071943 + 2.6 Combine like terms: 1.939071943 + 2.6 = 4.539071943 a = 4.539071943 Simplifying a = 4.539071943

Subproblem 2

a + -2.6 = -1.939071943 Simplifying a + -2.6 = -1.939071943 Reorder the terms: -2.6 + a = -1.939071943 Solving -2.6 + a = -1.939071943 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.6' to each side of the equation. -2.6 + 2.6 + a = -1.939071943 + 2.6 Combine like terms: -2.6 + 2.6 = 0.0 0.0 + a = -1.939071943 + 2.6 a = -1.939071943 + 2.6 Combine like terms: -1.939071943 + 2.6 = 0.660928057 a = 0.660928057 Simplifying a = 0.660928057

Solution

The solution to the problem is based on the solutions from the subproblems. a = {4.539071943, 0.660928057}

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