8a^2-5a-8=0

Simple and best practice solution for 8a^2-5a-8=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 8a^2-5a-8=0 equation:


Simplifying
8a2 + -5a + -8 = 0

Reorder the terms:
-8 + -5a + 8a2 = 0

Solving
-8 + -5a + 8a2 = 0

Solving for variable 'a'.

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

Divide each side by '8'.
-1 + -0.625a + a2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.625a + 1 + a2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.625a + a2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.625a + a2 = 0 + 1
-0.625a + a2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.625a + a2 = 1

The a term is -0.625a.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625a + 0.09765625 + a2 = 1 + 0.09765625

Reorder the terms:
0.09765625 + -0.625a + a2 = 1 + 0.09765625

Combine like terms: 1 + 0.09765625 = 1.09765625
0.09765625 + -0.625a + a2 = 1.09765625

Factor a perfect square on the left side:
(a + -0.3125)(a + -0.3125) = 1.09765625

Calculate the square root of the right side: 1.047690913

Break this problem into two subproblems by setting 
(a + -0.3125) equal to 1.047690913 and -1.047690913.

Subproblem 1

a + -0.3125 = 1.047690913 Simplifying a + -0.3125 = 1.047690913 Reorder the terms: -0.3125 + a = 1.047690913 Solving -0.3125 + a = 1.047690913 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + a = 1.047690913 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + a = 1.047690913 + 0.3125 a = 1.047690913 + 0.3125 Combine like terms: 1.047690913 + 0.3125 = 1.360190913 a = 1.360190913 Simplifying a = 1.360190913

Subproblem 2

a + -0.3125 = -1.047690913 Simplifying a + -0.3125 = -1.047690913 Reorder the terms: -0.3125 + a = -1.047690913 Solving -0.3125 + a = -1.047690913 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + a = -1.047690913 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + a = -1.047690913 + 0.3125 a = -1.047690913 + 0.3125 Combine like terms: -1.047690913 + 0.3125 = -0.735190913 a = -0.735190913 Simplifying a = -0.735190913

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.360190913, -0.735190913}

See similar equations:

| 3m(m-3)*-6(m-5)=2m^2-4m | | 2(2l+9)=38 | | 3m(m-3)*-6(m-5)=2m^2-4 | | -16x^2+18x+5=0 | | x=2/3(-6)+1 | | 2x^2+2=4x+5 | | 3m(m-3)-6(m-5)=2m^2-4 | | 2.50*1.16=2.9 | | 19n+37=4n+90 | | 18-8a-(13+3a)= | | 2ln(x-3)=-2 | | 3/8*4/5 | | (-1/2x)-(29/6x)=(-8/6) | | 10p^2-4p-5=0 | | y=2/3(-6)+1 | | 4b+2=-6 | | 5abs(2x-5)-3=12 | | 14-4x=5-7 | | 2/3(-6)+1=x | | 2x*5x=238 | | 18*x+4*x=56 | | 35-7x=36 | | y*y-64=0 | | 3y(y-25)=0 | | 1x+59+8x=19+x | | 6x(7-4(3-x))+4x-2(6x-7)=24 | | (121-2x)/x=5/3 | | 2x+2-5x-3=5 | | 3p-21=24 | | 2/4-3/4(2/5-1/10 | | 100+3(12)= | | (5x-18)(x+8)=0 |

Equations solver categories