4x^2-11x-80=0

Simple and best practice solution for 4x^2-11x-80=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-80=0 equation:


Simplifying
4x2 + -11x + -80 = 0

Reorder the terms:
-80 + -11x + 4x2 = 0

Solving
-80 + -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'.
-20 + -2.75x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -2.75x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -2.75x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -2.75x + x2 = 0 + 20
-2.75x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-2.75x + x2 = 20

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 = 20 + 1.890625

Reorder the terms:
1.890625 + -2.75x + x2 = 20 + 1.890625

Combine like terms: 20 + 1.890625 = 21.890625
1.890625 + -2.75x + x2 = 21.890625

Factor a perfect square on the left side:
(x + -1.375)(x + -1.375) = 21.890625

Calculate the square root of the right side: 4.678741818

Break this problem into two subproblems by setting 
(x + -1.375) equal to 4.678741818 and -4.678741818.

Subproblem 1

x + -1.375 = 4.678741818 Simplifying x + -1.375 = 4.678741818 Reorder the terms: -1.375 + x = 4.678741818 Solving -1.375 + x = 4.678741818 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 = 4.678741818 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = 4.678741818 + 1.375 x = 4.678741818 + 1.375 Combine like terms: 4.678741818 + 1.375 = 6.053741818 x = 6.053741818 Simplifying x = 6.053741818

Subproblem 2

x + -1.375 = -4.678741818 Simplifying x + -1.375 = -4.678741818 Reorder the terms: -1.375 + x = -4.678741818 Solving -1.375 + x = -4.678741818 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 = -4.678741818 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + x = -4.678741818 + 1.375 x = -4.678741818 + 1.375 Combine like terms: -4.678741818 + 1.375 = -3.303741818 x = -3.303741818 Simplifying x = -3.303741818

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.053741818, -3.303741818}

See similar equations:

| J-12=24 | | 4x+7=-x+3 | | b-6b-16=0 | | -11x-19=-63 | | Y-20=.6(X-4) | | 0.66v+6=.77-.83 | | x+y+60=90 | | 3x-(-3x-1)=5 | | -2m=-m+16 | | 2x+18y=-12 | | y=5*x^2 | | y=1*x^2 | | 18x-8=14-4x | | 5+3x-37=6x-23+8x | | 2(x+4)+12x=-4x+14 | | 6p^2+252=78p | | 10x+6y=340 | | (-3y)-(7)=2 | | 3(8x-4)=180 | | 12b-9+2n-b=-87 | | 7r^2-12r+4=0 | | (-k+6)(-8k-3)= | | x^2+4x+58=0 | | 6c^2-7cd-3d^2= | | 2n=4.4 | | h=-16t^2+44t+80 | | (-x+3)(4x-8)= | | (-2x+4)(-8x+5)= | | R-K=5y+Q | | (6v-3)(-4v+2)= | | y-20=-.6(x-4) | | 25=s+3-4s |

Equations solver categories