Answer:
50 degrees
Step-by-step explanation:
Since the two sides have the same length of 7 cm, it is an isosceles triangle so x = (180-80) / 2 = 50
Use the binomial theorem:
The <em>x</em> ³ terms occurs for 5 - <em>k</em> = 3, or <em>k</em> = 2, and its coefficient would be
380058.475044