An=-31+(n-1)-11 find the eleventh term
a11 = -31 + (-11) (11-1)
a11 = -31 +-11(10)
a11 =-31 +-110
a11 = -142
Answer:
25x²y² - 100
= 25(x²y² - 4)
= 25(xy + 2)(xy - 2)