2a^2+3a-7=35

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Solution for 2a^2+3a-7=35 equation:


Simplifying
2a2 + 3a + -7 = 35

Reorder the terms:
-7 + 3a + 2a2 = 35

Solving
-7 + 3a + 2a2 = 35

Solving for variable 'a'.

Reorder the terms:
-7 + -35 + 3a + 2a2 = 35 + -35

Combine like terms: -7 + -35 = -42
-42 + 3a + 2a2 = 35 + -35

Combine like terms: 35 + -35 = 0
-42 + 3a + 2a2 = 0

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

Divide each side by '2'.
-21 + 1.5a + a2 = 0

Move the constant term to the right:

Add '21' to each side of the equation.
-21 + 1.5a + 21 + a2 = 0 + 21

Reorder the terms:
-21 + 21 + 1.5a + a2 = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 1.5a + a2 = 0 + 21
1.5a + a2 = 0 + 21

Combine like terms: 0 + 21 = 21
1.5a + a2 = 21

The a term is 1.5a.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5a + 0.5625 + a2 = 21 + 0.5625

Reorder the terms:
0.5625 + 1.5a + a2 = 21 + 0.5625

Combine like terms: 21 + 0.5625 = 21.5625
0.5625 + 1.5a + a2 = 21.5625

Factor a perfect square on the left side:
(a + 0.75)(a + 0.75) = 21.5625

Calculate the square root of the right side: 4.643543905

Break this problem into two subproblems by setting 
(a + 0.75) equal to 4.643543905 and -4.643543905.

Subproblem 1

a + 0.75 = 4.643543905 Simplifying a + 0.75 = 4.643543905 Reorder the terms: 0.75 + a = 4.643543905 Solving 0.75 + a = 4.643543905 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + a = 4.643543905 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + a = 4.643543905 + -0.75 a = 4.643543905 + -0.75 Combine like terms: 4.643543905 + -0.75 = 3.893543905 a = 3.893543905 Simplifying a = 3.893543905

Subproblem 2

a + 0.75 = -4.643543905 Simplifying a + 0.75 = -4.643543905 Reorder the terms: 0.75 + a = -4.643543905 Solving 0.75 + a = -4.643543905 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + a = -4.643543905 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + a = -4.643543905 + -0.75 a = -4.643543905 + -0.75 Combine like terms: -4.643543905 + -0.75 = -5.393543905 a = -5.393543905 Simplifying a = -5.393543905

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.893543905, -5.393543905}

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