All angles in a triangle add to 180
so
w+2w+69=180
3w+69=180
3w=111
w=37
Looks like the area of each face is already given, so just add up all of the numbers to get 65 cm2
Answer: the list of roots is {-4, 2, -3+2i, -3-2i}
Use the quadratic formula to get the roots of the two separate terms in brackets:
x^2+6x+8=0 has solutions: -4 and 2
x^2+6x+13=0 has solutions: -3+2i and -3-2i
