5(4a)(4a)+7(4a)-9=

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Solution for 5(4a)(4a)+7(4a)-9= equation:


Simplifying
5(4a)(4a) + 7(4a) + -9 = 0

Remove parenthesis around (4a)
5 * 4a(4a) + 7(4a) + -9 = 0

Remove parenthesis around (4a)
5 * 4a * 4a + 7(4a) + -9 = 0

Reorder the terms for easier multiplication:
5 * 4 * 4a * a + 7(4a) + -9 = 0

Multiply 5 * 4
20 * 4a * a + 7(4a) + -9 = 0

Multiply 20 * 4
80a * a + 7(4a) + -9 = 0

Multiply a * a
80a2 + 7(4a) + -9 = 0

Remove parenthesis around (4a)
80a2 + 7 * 4a + -9 = 0

Multiply 7 * 4
80a2 + 28a + -9 = 0

Reorder the terms:
-9 + 28a + 80a2 = 0

Solving
-9 + 28a + 80a2 = 0

Solving for variable 'a'.

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

Divide each side by '80'.
-0.1125 + 0.35a + a2 = 0.0

Move the constant term to the right:

Add '0.1125' to each side of the equation.
-0.1125 + 0.35a + 0.1125 + a2 = 0.0 + 0.1125

Reorder the terms:
-0.1125 + 0.1125 + 0.35a + a2 = 0.0 + 0.1125

Combine like terms: -0.1125 + 0.1125 = 0.0000
0.0000 + 0.35a + a2 = 0.0 + 0.1125
0.35a + a2 = 0.0 + 0.1125

Combine like terms: 0.0 + 0.1125 = 0.1125
0.35a + a2 = 0.1125

The a term is 0.35a.  Take half its coefficient (0.175).
Square it (0.030625) and add it to both sides.

Add '0.030625' to each side of the equation.
0.35a + 0.030625 + a2 = 0.1125 + 0.030625

Reorder the terms:
0.030625 + 0.35a + a2 = 0.1125 + 0.030625

Combine like terms: 0.1125 + 0.030625 = 0.143125
0.030625 + 0.35a + a2 = 0.143125

Factor a perfect square on the left side:
(a + 0.175)(a + 0.175) = 0.143125

Calculate the square root of the right side: 0.378318649

Break this problem into two subproblems by setting 
(a + 0.175) equal to 0.378318649 and -0.378318649.

Subproblem 1

a + 0.175 = 0.378318649 Simplifying a + 0.175 = 0.378318649 Reorder the terms: 0.175 + a = 0.378318649 Solving 0.175 + a = 0.378318649 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.175' to each side of the equation. 0.175 + -0.175 + a = 0.378318649 + -0.175 Combine like terms: 0.175 + -0.175 = 0.000 0.000 + a = 0.378318649 + -0.175 a = 0.378318649 + -0.175 Combine like terms: 0.378318649 + -0.175 = 0.203318649 a = 0.203318649 Simplifying a = 0.203318649

Subproblem 2

a + 0.175 = -0.378318649 Simplifying a + 0.175 = -0.378318649 Reorder the terms: 0.175 + a = -0.378318649 Solving 0.175 + a = -0.378318649 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.175' to each side of the equation. 0.175 + -0.175 + a = -0.378318649 + -0.175 Combine like terms: 0.175 + -0.175 = 0.000 0.000 + a = -0.378318649 + -0.175 a = -0.378318649 + -0.175 Combine like terms: -0.378318649 + -0.175 = -0.553318649 a = -0.553318649 Simplifying a = -0.553318649

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.203318649, -0.553318649}

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