Answer:
a = 1
Step-by-step explanation:
(x²+x-1)(x-1) = x³+x²-x-x²-x+1 = x³-2x+1
Whatever is raised to the power of 0 is 1
SO the answer is 1
13
x/y = 4
x=4y
x - y = 39
4y - y = 39
3y = 39
y= 13