Select the angle that correctly completes the law of cosines for this triangle. 15^2+17^2-2(15)(17)cos__=8^2 a.) 62 degrees b.) 90 degrees c.) 180 degrees d.) 28 degrees

Well we have to do pemdas.
15*17=225
15*2=30
17*2=34
So then do the expression
30+34-2*225
30+35=64-2=62*225=13,950
Then you have to divide by 8^2 but you have to do the exponents first
8*2=16
Then divide 13,950 by 16
13,950/16=871.87
So basically none of those would be right

The first option would be correct if it were one half and not one