5a^2+4a-10=0

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Solution for 5a^2+4a-10=0 equation:


Simplifying
5a2 + 4a + -10 = 0

Reorder the terms:
-10 + 4a + 5a2 = 0

Solving
-10 + 4a + 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'.
-2 + 0.8a + a2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 0.8a + 2 + a2 = 0 + 2

Reorder the terms:
-2 + 2 + 0.8a + a2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 0.8a + a2 = 0 + 2
0.8a + a2 = 0 + 2

Combine like terms: 0 + 2 = 2
0.8a + a2 = 2

The a term is 0.8a.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8a + 0.16 + a2 = 2 + 0.16

Reorder the terms:
0.16 + 0.8a + a2 = 2 + 0.16

Combine like terms: 2 + 0.16 = 2.16
0.16 + 0.8a + a2 = 2.16

Factor a perfect square on the left side:
(a + 0.4)(a + 0.4) = 2.16

Calculate the square root of the right side: 1.469693846

Break this problem into two subproblems by setting 
(a + 0.4) equal to 1.469693846 and -1.469693846.

Subproblem 1

a + 0.4 = 1.469693846 Simplifying a + 0.4 = 1.469693846 Reorder the terms: 0.4 + a = 1.469693846 Solving 0.4 + a = 1.469693846 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + a = 1.469693846 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + a = 1.469693846 + -0.4 a = 1.469693846 + -0.4 Combine like terms: 1.469693846 + -0.4 = 1.069693846 a = 1.069693846 Simplifying a = 1.069693846

Subproblem 2

a + 0.4 = -1.469693846 Simplifying a + 0.4 = -1.469693846 Reorder the terms: 0.4 + a = -1.469693846 Solving 0.4 + a = -1.469693846 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + a = -1.469693846 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + a = -1.469693846 + -0.4 a = -1.469693846 + -0.4 Combine like terms: -1.469693846 + -0.4 = -1.869693846 a = -1.869693846 Simplifying a = -1.869693846

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.069693846, -1.869693846}

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