Solve for X: Triangle Angle Equation (120.2-X = 0.88X+50)

Question

Calculate the value of X.

120.2-X120.2-X120.2-XAAABBBCCC0.88X+50

Video Solution

Solution Steps

00:00 Find X
00:03 The sum of angles in a triangle equals 180
00:07 Substitute appropriate values according to the given data and solve for X
00:17 Take X out of the parentheses and collect terms
00:44 Solve what's inside the parentheses
00:52 Isolate X
01:07 And this is the solution to the problem

Step-by-Step Solution

Let's remember that the sum of angles in a triangle equals 180 degrees.

Therefore, to find X, we will use the following equation:

A+B+C=180 A+B+C=180

Now let's substitute the known data:

12x+6+120.2x+0.88x+50=180 \frac{1}{2}x+6+120.2-x+0.88x+50=180

We'll factor out X as a common term in the equation:

x(121+0.88)+176.2=180 x(\frac{1}{2}-1+0.88)+176.2=180

Let's expand the parentheses:

12xx+0.88x+176.2=180 \frac{1}{2}x-x+0.88x+176.2=180

We'll combine the X terms:

0.38x+176.2=180 0.38x+176.2=180

We'll move terms to opposite sides and maintain the appropriate sign:

0.38x=180176.2 \text{0}.38x=180-176.2

0.38x=3.8 0.38x=3.8

We'll divide both sides by 0.38:

x=10 x=10

Answer

10 10