Question

If a= -2, b= 3, evaluate the following:
(i) 25a-³
(ii) 27a²b-³
(iii) 162(-a)-¹(b)-³​

Answer 1

Step-by-step explanation:

We have a = -2 , b = 3

Now , (i) 25a ^-3 = 25 (-2)^-3 = 25 × 1/ -8 = -25/8

(ii) 27(a)^2(b)^-3 = 27(-2)^2(3)^-3 = 27×4×1/9 = 12

(iii)162(-a)^-1(b)-3 = 162(2)^-1(3)^-3 = 162 × 1/2 × 1/27 = 3