Answer:
1.326
Step-by-step explanation:
4x³-x-7 = 1
4x³-x-8 = 0
x ≅ 1.326, -0.663+1.034i, -0.663-1.034i
-0.663+1.034i and -0.663-1.034i are extraneous solutions.
x ≅ 1.326
-3,-2,-1,0,1,2,3,4,5
286 degrees
Your formula would be 5 x 180/π
40