4x^2+11x-8=0

Simple and best practice solution for 4x^2+11x-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 4x^2+11x-8=0 equation:


Simplifying
4x2 + 11x + -8 = 0

Reorder the terms:
-8 + 11x + 4x2 = 0

Solving
-8 + 11x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-2 + 2.75x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 2.75x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 2.75x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 2.75x + x2 = 0 + 2
2.75x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
2.75x + x2 = 2

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = 2 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = 2 + 1.890625

Combine like terms: 2 + 1.890625 = 3.890625
1.890625 + 2.75x + x2 = 3.890625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 3.890625

Calculate the square root of the right side: 1.97246673

Break this problem into two subproblems by setting 
(x + 1.375) equal to 1.97246673 and -1.97246673.

Subproblem 1

x + 1.375 = 1.97246673 Simplifying x + 1.375 = 1.97246673 Reorder the terms: 1.375 + x = 1.97246673 Solving 1.375 + x = 1.97246673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 1.97246673 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 1.97246673 + -1.375 x = 1.97246673 + -1.375 Combine like terms: 1.97246673 + -1.375 = 0.59746673 x = 0.59746673 Simplifying x = 0.59746673

Subproblem 2

x + 1.375 = -1.97246673 Simplifying x + 1.375 = -1.97246673 Reorder the terms: 1.375 + x = -1.97246673 Solving 1.375 + x = -1.97246673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -1.97246673 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -1.97246673 + -1.375 x = -1.97246673 + -1.375 Combine like terms: -1.97246673 + -1.375 = -3.34746673 x = -3.34746673 Simplifying x = -3.34746673

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.59746673, -3.34746673}

See similar equations:

| 6k-4(k+6)=-2 | | 8(-2+7m)=32+8m | | -(8-6a)-(32+5a)-1=-(4-7a)+(-a)+3 | | .5(x+5)-4=.33(2x-1) | | 2(9n-1)-(10+x)=35 | | 4(x-3)+(x-1)=28 | | 5(2m+3)-(1-2m)=2[3(3+2m)-3-m] | | 5/8+5/8= | | 6(2b+5)=-4b+52 | | 2(c+5)=90 | | 11x=15-4x | | 6(9a-3b)-8(2a+4b)=0 | | 2/5=x/3 | | -6(3-x)+1=3(x-3) | | 5-2x=66 | | 900x-200=500x+600 | | 3(x-4)=-x-4 | | 5m-8m+42=96 | | -4(6x+3)=-60 | | 5-2x=61 | | 10d-8=4d-20+2d | | x^3+5x^2-2x-10=0 | | -2(1-4x)=3x+8 | | -4(8m+1)=7(5-4m)-m | | 7(x-2)=12x-17 | | 2(x-4)=9x+4 | | -x/3=24 | | 1/3-2b=3 | | m+[-4m]= | | -266=3x+7(-7+4x) | | 17=-2n+13-8n | | 7x+5=-2x+59 |

Equations solver categories