x^2+16x=-4

Simple and best practice solution for x^2+16x=-4 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^2+16x=-4 equation:


Simplifying
x2 + 16x = -4

Reorder the terms:
16x + x2 = -4

Solving
16x + x2 = -4

Solving for variable 'x'.

Reorder the terms:
4 + 16x + x2 = -4 + 4

Combine like terms: -4 + 4 = 0
4 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 16x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 16x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 16x + x2 = 0 + -4
16x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
16x + x2 = -4

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = -4 + 64

Reorder the terms:
64 + 16x + x2 = -4 + 64

Combine like terms: -4 + 64 = 60
64 + 16x + x2 = 60

Factor a perfect square on the left side:
(x + 8)(x + 8) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(x + 8) equal to 7.745966692 and -7.745966692.

Subproblem 1

x + 8 = 7.745966692 Simplifying x + 8 = 7.745966692 Reorder the terms: 8 + x = 7.745966692 Solving 8 + x = 7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 7.745966692 + -8 Combine like terms: 8 + -8 = 0 0 + x = 7.745966692 + -8 x = 7.745966692 + -8 Combine like terms: 7.745966692 + -8 = -0.254033308 x = -0.254033308 Simplifying x = -0.254033308

Subproblem 2

x + 8 = -7.745966692 Simplifying x + 8 = -7.745966692 Reorder the terms: 8 + x = -7.745966692 Solving 8 + x = -7.745966692 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -7.745966692 + -8 Combine like terms: 8 + -8 = 0 0 + x = -7.745966692 + -8 x = -7.745966692 + -8 Combine like terms: -7.745966692 + -8 = -15.745966692 x = -15.745966692 Simplifying x = -15.745966692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.254033308, -15.745966692}

See similar equations:

| 4[6-2(2m+1)]-7m= | | 36.7=-x^2+7x | | Y=24.5+12.25 | | 0=-x^2+7x | | 3y+16=6y-1 | | 2x^2+10x-36=0 | | 2x^2+10-36=0 | | Y=49+49 | | 8+x/2=10 | | -98=-x^2+7x | | 98=-x^2+7x | | 98=-2x^2+7x | | Y=-2x^2+7x | | x^2-4x+2=mx-2 | | (4w-5x-3)(3w+6)= | | x+x+2+x+4=177 | | 2x+2(3x+8)=28 | | 9y+165=5y+120 | | 40x+5(1.5x)=285 | | 17-3x=31-x | | 31-x=17-3x | | 3x+5=25-2x | | x+32=x-31 | | 40x+2(1.5)=774 | | -4b=12 | | 4-3=2x+13 | | 3x^2-10x-88=0 | | c-5=4 | | c=-4 | | 9y+165=-5y+120 | | 2(x+1)+20= | | c-1=0 |

Equations solver categories