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September 5, 2015
Posted by **nelly** on Sunday, December 2, 2012 at 11:01pm.

- algebra -
**Shawn**, Sunday, December 2, 2012 at 11:55pmThe guy wire, the telephone phone and the ground form a right-angled triangle.

Your measurements are x, x+4, and 20.

To solve for x, you could use the Pythagorean Theorem, a^2+b^2=c^2.

Let a=x

Let b=x+4

Let c=20

First, plug in the values for a, b and c, and then simplify.

From here, solve for x by either factoring, or using the quadratic formula (I'm going to use the quadratic formula).

Now, plug in the values of x into the original formula

The measurement of the telephone pole is x.

My values of x are 12 and -16.

If we substitute the values of x in,

only x=12 makes sense,

because a telephone pole with height -16 is impossible

hope it helps.