4a^2+8a-13=0

Simple and best practice solution for 4a^2+8a-13=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 4a^2+8a-13=0 equation:


Simplifying
4a2 + 8a + -13 = 0

Reorder the terms:
-13 + 8a + 4a2 = 0

Solving
-13 + 8a + 4a2 = 0

Solving for variable 'a'.

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

Divide each side by '4'.
-3.25 + 2a + a2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + 2a + 3.25 + a2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + 2a + a2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + 2a + a2 = 0 + 3.25
2a + a2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
2a + a2 = 3.25

The a term is 2a.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2a + 1 + a2 = 3.25 + 1

Reorder the terms:
1 + 2a + a2 = 3.25 + 1

Combine like terms: 3.25 + 1 = 4.25
1 + 2a + a2 = 4.25

Factor a perfect square on the left side:
(a + 1)(a + 1) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(a + 1) equal to 2.061552813 and -2.061552813.

Subproblem 1

a + 1 = 2.061552813 Simplifying a + 1 = 2.061552813 Reorder the terms: 1 + a = 2.061552813 Solving 1 + a = 2.061552813 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = 2.061552813 + -1 Combine like terms: 1 + -1 = 0 0 + a = 2.061552813 + -1 a = 2.061552813 + -1 Combine like terms: 2.061552813 + -1 = 1.061552813 a = 1.061552813 Simplifying a = 1.061552813

Subproblem 2

a + 1 = -2.061552813 Simplifying a + 1 = -2.061552813 Reorder the terms: 1 + a = -2.061552813 Solving 1 + a = -2.061552813 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + a = -2.061552813 + -1 Combine like terms: 1 + -1 = 0 0 + a = -2.061552813 + -1 a = -2.061552813 + -1 Combine like terms: -2.061552813 + -1 = -3.061552813 a = -3.061552813 Simplifying a = -3.061552813

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.061552813, -3.061552813}

See similar equations:

| 5(6+2x)=20x-14 | | (2x-14)+2x+(3x+10)=180 | | 8*7*6*5*4*3*2*1= | | 7x+9y-5x= | | 2x+27=-4x+119 | | 4=6-2a | | (2n+2)(8n^2-4n+8)= | | 2x+27=4x+119 | | 2y+8=-2y-8 | | x^4-35x^2+196=0 | | s^2+6s-10=8 | | 30y+8=14 | | s^2+12s-29=10 | | -16x^2=8x-5 | | n^2+n+1=0 | | s^2+12s-11=35 | | -12x-14=-110 | | 4x-5=3x+0 | | -32+6(3y+4)=-(-5y+38)+3x | | a/3+5=16 | | (0.31)x(2.7)= | | 8x^3=50x | | 4x^2=-24x-28 | | m^2+4x+3=0 | | lny=6 | | 3m-5=19 | | 2*b+1=5 | | 16x^2=52x | | 3x^2-6x+2=y | | g^2-16g+37=0 | | 6*b-1=-7 | | 16x^2=8x+2 |

Equations solver categories