7x^2-14x-28=0

Simple and best practice solution for 7x^2-14x-28=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 7x^2-14x-28=0 equation:


Simplifying
7x2 + -14x + -28 = 0

Reorder the terms:
-28 + -14x + 7x2 = 0

Solving
-28 + -14x + 7x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '7'.
7(-4 + -2x + x2) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-4 + -2x + x2)' equal to zero and attempt to solve: Simplifying -4 + -2x + x2 = 0 Solving -4 + -2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '4' to each side of the equation. -4 + -2x + 4 + x2 = 0 + 4 Reorder the terms: -4 + 4 + -2x + x2 = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -2x + x2 = 0 + 4 -2x + x2 = 0 + 4 Combine like terms: 0 + 4 = 4 -2x + x2 = 4 The x term is -2x. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2x + 1 + x2 = 4 + 1 Reorder the terms: 1 + -2x + x2 = 4 + 1 Combine like terms: 4 + 1 = 5 1 + -2x + x2 = 5 Factor a perfect square on the left side: (x + -1)(x + -1) = 5 Calculate the square root of the right side: 2.236067978 Break this problem into two subproblems by setting (x + -1) equal to 2.236067978 and -2.236067978.

Subproblem 1

x + -1 = 2.236067978 Simplifying x + -1 = 2.236067978 Reorder the terms: -1 + x = 2.236067978 Solving -1 + x = 2.236067978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + x = 2.236067978 + 1 x = 2.236067978 + 1 Combine like terms: 2.236067978 + 1 = 3.236067978 x = 3.236067978 Simplifying x = 3.236067978

Subproblem 2

x + -1 = -2.236067978 Simplifying x + -1 = -2.236067978 Reorder the terms: -1 + x = -2.236067978 Solving -1 + x = -2.236067978 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + x = -2.236067978 + 1 x = -2.236067978 + 1 Combine like terms: -2.236067978 + 1 = -1.236067978 x = -1.236067978 Simplifying x = -1.236067978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.236067978, -1.236067978}

Solution

x = {3.236067978, -1.236067978}

See similar equations:

| -0.14(.143)+0.1(.143-2)=-0.24(1-.143) | | 7x-(6x+9)=4x-48 | | w(5)+0.50=m | | (x+5)3+(x+3)5=1 | | (w)5+.50=m | | 40+20x=70+18x | | (X-5)3+(x+3)5=1 | | 4x+7xy=11y | | 8z^3=-12z^2-4z | | -28=-6n | | .1x=.7+.2x | | 2X+5=7x+9 | | 0.7h+2(h-3)=0.2h+3 | | 4d=26-9d | | .1x=.7+.2t | | 2p-29=-6 | | 5(y+1)-7=3(y+1)+2y | | (X+6)(x+6)(3x-2)=180 | | 65=-6k-1 | | 4(5+2x)=7(x-1) | | 5(x/6-2) | | 12-(7x-3)=0 | | 6x+10=11x-5 | | 2x-8+3x=42 | | 100=2.5x-15 | | 12x-31+2= | | X+2=-5x+20 | | 13x+18y-17=0 | | 4x+1=3x-20 | | -5+9n=-59 | | 10x+1(9x-11)= | | 6x-13+x=7x-13 |

Equations solver categories