Use the power rule a m a n = a m + n a m a n = a m + n to combine exponents. − 56 + 21 i + 48 i − 18 i 1 + 1 - 56 + 21 i + 48 i - 18 i 1 + 1 Add 1 1 and 1 1 to get 2 2 . − 56 + 21 i + 48 i − 18 i 2 - 56 + 21 i + 48 i - 18 i 2 Rewrite i 2 i 2 as − 1 - 1 . − 56 + 21 i + 48 i − 18 ⋅ − 1 - 56 + 21 i + 48 i - 18 ⋅ - 1 Multiply − 18 - 18 by − 1 - 1 to get 18 18 . − 56 + 21 i + 48 i + 18 - 56 + 21 i + 48 i + 18 Add − 56 - 56 and 18 18 to get − 38 - 38 . − 38 + 21 i + 48 i - 38 + 21 i + 48 i Add 21 i 21 i and 48 i 48 i to get 69 i 69 i . −
That triangle is isosceles, so the bottom two angles will always be equal. With that said, the equation will be 2(65), and that equals 130. After that, subtract 180-130, and that gives you x! In total, your calculations should look like this: 2(65) 180-130 x=50°
