5x^2-15x-16=0

Simple and best practice solution for 5x^2-15x-16=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 5x^2-15x-16=0 equation:


Simplifying
5x2 + -15x + -16 = 0

Reorder the terms:
-16 + -15x + 5x2 = 0

Solving
-16 + -15x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-3.2 + -3x + x2 = 0

Move the constant term to the right:

Add '3.2' to each side of the equation.
-3.2 + -3x + 3.2 + x2 = 0 + 3.2

Reorder the terms:
-3.2 + 3.2 + -3x + x2 = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + -3x + x2 = 0 + 3.2
-3x + x2 = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
-3x + x2 = 3.2

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 = 3.2 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 3.2 + 2.25

Combine like terms: 3.2 + 2.25 = 5.45
2.25 + -3x + x2 = 5.45

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 5.45

Calculate the square root of the right side: 2.334523506

Break this problem into two subproblems by setting 
(x + -1.5) equal to 2.334523506 and -2.334523506.

Subproblem 1

x + -1.5 = 2.334523506 Simplifying x + -1.5 = 2.334523506 Reorder the terms: -1.5 + x = 2.334523506 Solving -1.5 + x = 2.334523506 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 = 2.334523506 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 2.334523506 + 1.5 x = 2.334523506 + 1.5 Combine like terms: 2.334523506 + 1.5 = 3.834523506 x = 3.834523506 Simplifying x = 3.834523506

Subproblem 2

x + -1.5 = -2.334523506 Simplifying x + -1.5 = -2.334523506 Reorder the terms: -1.5 + x = -2.334523506 Solving -1.5 + x = -2.334523506 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 = -2.334523506 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -2.334523506 + 1.5 x = -2.334523506 + 1.5 Combine like terms: -2.334523506 + 1.5 = -0.834523506 x = -0.834523506 Simplifying x = -0.834523506

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.834523506, -0.834523506}

See similar equations:

| 9(4x+3x)-22= | | 9r-5r-2r= | | -2y=3x-8 | | 9x-5(x-5)=2(x-3)+7 | | -x^2-9x+162=0 | | 4(2x+3)=8x+12 | | 12=k-2 | | 36x^2-18x-4=0 | | -14+3x=3(x+2) | | v=v^0+at | | -5s-14=2(2s+3)-9s | | 344=-8(6v-1) | | p(x)=x^4-6x^3+11x^2-18 | | -4(3w-5)=3w-13 | | 5x+114=50 | | 4m-3=(-1) | | 2(-7)+y=.1(y+3) | | 28=8x+7x | | 5c=c+28 | | 4y+9=7y-4y | | 8(x-3)=8(x+1) | | 50,679,000+982,000x=58,878,000+222,000x | | 7(4v+7)-1=12-8v | | 4b+5-2b=25 | | 15p^2+pq-2q^2=0 | | s-8=21 | | 5(6t+1)-14=t-(t+8) | | 12x-15x+3=18 | | 240-300=x | | 4b+-2b=25 | | -2g+12=48 | | 8(x-3)=2x |

Equations solver categories