5x^2+16x-8=0

Simple and best practice solution for 5x^2+16x-8=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+16x-8=0 equation:


Simplifying
5x2 + 16x + -8 = 0

Reorder the terms:
-8 + 16x + 5x2 = 0

Solving
-8 + 16x + 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'.
-1.6 + 3.2x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + 3.2x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + 3.2x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + 3.2x + x2 = 0 + 1.6
3.2x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
3.2x + x2 = 1.6

The x term is 3.2x.  Take half its coefficient (1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
3.2x + 2.56 + x2 = 1.6 + 2.56

Reorder the terms:
2.56 + 3.2x + x2 = 1.6 + 2.56

Combine like terms: 1.6 + 2.56 = 4.16
2.56 + 3.2x + x2 = 4.16

Factor a perfect square on the left side:
(x + 1.6)(x + 1.6) = 4.16

Calculate the square root of the right side: 2.039607805

Break this problem into two subproblems by setting 
(x + 1.6) equal to 2.039607805 and -2.039607805.

Subproblem 1

x + 1.6 = 2.039607805 Simplifying x + 1.6 = 2.039607805 Reorder the terms: 1.6 + x = 2.039607805 Solving 1.6 + x = 2.039607805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = 2.039607805 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = 2.039607805 + -1.6 x = 2.039607805 + -1.6 Combine like terms: 2.039607805 + -1.6 = 0.439607805 x = 0.439607805 Simplifying x = 0.439607805

Subproblem 2

x + 1.6 = -2.039607805 Simplifying x + 1.6 = -2.039607805 Reorder the terms: 1.6 + x = -2.039607805 Solving 1.6 + x = -2.039607805 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = -2.039607805 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = -2.039607805 + -1.6 x = -2.039607805 + -1.6 Combine like terms: -2.039607805 + -1.6 = -3.639607805 x = -3.639607805 Simplifying x = -3.639607805

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.439607805, -3.639607805}

See similar equations:

| 14-(-4)-3+13= | | 9+3u=81-15u | | 11a^2+39a+18=0 | | 9x+3=9-bracket(4x-5) | | 5/6t=-8/9 | | 4(2a-b)-6(3b-7a)= | | (5x^2)+(7x^3)+(9x^4)=0 | | 2z^2+19z+42=0 | | log(2x)=log(x+5) | | 9x^2+12x+144=0 | | 4(3x-6)=12x-24 | | 2/2×5/10 | | y=6x^3+3x+1 | | 5x^2-9x+4=-12 | | 3(7s+5)-9s=3(4s+4)-17 | | X^3+1x^2-6x=0 | | -16x^2+45x-3=0 | | -8rs-9rs+st= | | 6-3k=45 | | X-2+3x-18=180 | | 3x-5=6x-13 | | y=2x^3-3x^2-12x-32 | | 6(2a-b)-8(7b-8a)= | | 3*(5-2)=X | | 3*(5-2)= | | log(3)(4m+5)=4 | | 53+(-18)=7 | | 3X(5-2)= | | 28-5k=10+4k | | 0.2(x+30)+1.4x=70 | | x-2p+4=0 | | 2(w+1)=-4 |

Equations solver categories