x^2+1=3x+15

Simple and best practice solution for x^2+1=3x+15 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+1=3x+15 equation:


Simplifying
x2 + 1 = 3x + 15

Reorder the terms:
1 + x2 = 3x + 15

Reorder the terms:
1 + x2 = 15 + 3x

Solving
1 + x2 = 15 + 3x

Solving for variable 'x'.

Reorder the terms:
1 + -15 + -3x + x2 = 15 + 3x + -15 + -3x

Combine like terms: 1 + -15 = -14
-14 + -3x + x2 = 15 + 3x + -15 + -3x

Reorder the terms:
-14 + -3x + x2 = 15 + -15 + 3x + -3x

Combine like terms: 15 + -15 = 0
-14 + -3x + x2 = 0 + 3x + -3x
-14 + -3x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-14 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -3x + 14 + x2 = 0 + 14

Reorder the terms:
-14 + 14 + -3x + x2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -3x + x2 = 0 + 14
-3x + x2 = 0 + 14

Combine like terms: 0 + 14 = 14
-3x + x2 = 14

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 14 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 14 + 2.25

Combine like terms: 14 + 2.25 = 16.25
2.25 + -3x + x2 = 16.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -1.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + -1.5 = 4.031128874 Simplifying x + -1.5 = 4.031128874 Reorder the terms: -1.5 + x = 4.031128874 Solving -1.5 + x = 4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 4.031128874 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 4.031128874 + 1.5 x = 4.031128874 + 1.5 Combine like terms: 4.031128874 + 1.5 = 5.531128874 x = 5.531128874 Simplifying x = 5.531128874

Subproblem 2

x + -1.5 = -4.031128874 Simplifying x + -1.5 = -4.031128874 Reorder the terms: -1.5 + x = -4.031128874 Solving -1.5 + x = -4.031128874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -4.031128874 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -4.031128874 + 1.5 x = -4.031128874 + 1.5 Combine like terms: -4.031128874 + 1.5 = -2.531128874 x = -2.531128874 Simplifying x = -2.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.531128874, -2.531128874}

See similar equations:

| 5m-4m+3c-7c= | | -69=7c-6 | | 6x=12x-2 | | x-44=46 | | 5x+4=7(x+1)-3x | | .25=.25h+4 | | x+(x+1)=74 | | x(2x+5)=220 | | u=n | | -8(y+3)=-13y-4 | | -8(y+13)=-13y-4 | | x-3+x+5=x | | 10m-12=4m+6 | | 9+4t=1 | | (n-10)=0 | | 2n-3=13 | | 7h+15=57 | | 2f^2-5f-10=0 | | 4f^2-5f+10=0 | | 6x+4(2-x)= | | 8f^2-10f+20=0 | | 11x+14=3x+2 | | -2(5x-3)= | | y-3y+4=y+1 | | 7c^2-2c-1=0 | | 8x^2+7x-3=0 | | 7t^2-40t-63= | | 6w-30-3w=12 | | c(x+2)-5=b(x-3) | | v=s^2+sh | | 3x^2+14x+4=0 | | -1.6=0.5x |

Equations solver categories