(3,5a^15/b^10)*(b^24/0,25a^26)^(1/2) = (3,5*(a^15)*(b^12))/((b^10)*0,5*(a^13) = 7*(a^2)*(b^2)
a₁ = - 3
a₂ = 1
d = a₂ - a₁ = 1 - (- 3) = 1 + 3 = 4
a₁₁ = a₁ + 10d = - 3 + 10 * 4 = - 3 + 40 = 37