(x)(x+4)=91

Simple and best practice solution for (x)(x+4)=91 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 (x)(x+4)=91 equation:


Simplifying
(x)(x + 4) = 91

Reorder the terms:
x(4 + x) = 91
(4 * x + x * x) = 91
(4x + x2) = 91

Solving
4x + x2 = 91

Solving for variable 'x'.

Reorder the terms:
-91 + 4x + x2 = 91 + -91

Combine like terms: 91 + -91 = 0
-91 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '91' to each side of the equation.
-91 + 4x + 91 + x2 = 0 + 91

Reorder the terms:
-91 + 91 + 4x + x2 = 0 + 91

Combine like terms: -91 + 91 = 0
0 + 4x + x2 = 0 + 91
4x + x2 = 0 + 91

Combine like terms: 0 + 91 = 91
4x + x2 = 91

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 91 + 4

Reorder the terms:
4 + 4x + x2 = 91 + 4

Combine like terms: 91 + 4 = 95
4 + 4x + x2 = 95

Factor a perfect square on the left side:
(x + 2)(x + 2) = 95

Calculate the square root of the right side: 9.746794345

Break this problem into two subproblems by setting 
(x + 2) equal to 9.746794345 and -9.746794345.

Subproblem 1

x + 2 = 9.746794345 Simplifying x + 2 = 9.746794345 Reorder the terms: 2 + x = 9.746794345 Solving 2 + x = 9.746794345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 9.746794345 + -2 Combine like terms: 2 + -2 = 0 0 + x = 9.746794345 + -2 x = 9.746794345 + -2 Combine like terms: 9.746794345 + -2 = 7.746794345 x = 7.746794345 Simplifying x = 7.746794345

Subproblem 2

x + 2 = -9.746794345 Simplifying x + 2 = -9.746794345 Reorder the terms: 2 + x = -9.746794345 Solving 2 + x = -9.746794345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -9.746794345 + -2 Combine like terms: 2 + -2 = 0 0 + x = -9.746794345 + -2 x = -9.746794345 + -2 Combine like terms: -9.746794345 + -2 = -11.746794345 x = -11.746794345 Simplifying x = -11.746794345

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.746794345, -11.746794345}

See similar equations:

| 8m+10m=144 | | 4x-9+3x+6-x-4= | | 43.98+33x=96.8*4 | | 19-6n=-(-1+8n)+6 | | 6.098+45.08=45.97x+55.9-76.8x | | 55x-6.08+77.9=99.87x+55 | | -10.8x=86.4 | | 55.876+3.08-55.7x=5x+67 | | 16x-7=5+10x | | 4(b+4)=6(b+4) | | -5y+4=-4(2y+5) | | 63*17=5x+77x*3-5x | | 1.25x=1.5 | | -8(v+5)=3(2-6v)+4 | | 6x+1=4x+17 | | 2t=-46 | | -(8y-2)-(-7y+4)=-6 | | -3x-14=7 | | 87*55+70-44x=85x+45 | | 3(2x-1)=x+4 | | 9r=-27 | | 11.3x=90.4 | | 4(n-3)=7 | | 3k^2+6k-24=0 | | 6x+19=7x+6 | | 4x^2-x-17=0 | | -5(2b+3)+(11b-2)=0 | | 6(1+4m)=-8(-2m+5)-4 | | 0=5+2x(3+4x) | | 3(n+2)-6n=-7(-n+2) | | 420=29f-7 | | 6t=69 |

Equations solver categories