Question

Need help with this one, no clue how to solve this. If someone could explain what's going on like I'm 5 it'd be much appreciated.

Find x.

Answer 1

Question 10

cos 45 = x/10

cos 45(10) = x

(1/sqrt{2})*10 = x

10/sqrt{2} = x

Rationalize the denominator.

[10/sqrt{2}] • [sqrt{2}/sqrt{2}] = x

10•sqrt{2} ÷ 2 = x

5• sqrt{2} = x