Home

How to Solve for X (advanced)

Feb 15, 2010 08:10 AM

Mathematical equation being solved on a whiteboard.

The video describes how to find 'x' in the algebraic equation

-3x + 7x - 6 = 30

The equation is solved on a white board by hand.

The method shown uses the following steps:

Firstly both 'x' terms are added together to get the equation 4x - 6 = 30.

Then 6 is added to both sides to get 4x = 36.

Now we divide both sides by 4, to get x = 9.

Once the equation is solved, the video then goes over how to check that your solution is correct, by substituting 9 in for 'x' and making sure both sides have the same value.

You already know how to use your phone. With Gadget Hacks' newsletter, we'll show you how to master it. Each week, we explore features, hidden tools, and advanced settings that give you more control over iOS and Android than most users even know exists.