Question

2−3×2−5 is equal to_______.

A
28
B
22
C
22
D
128

Solution

The correct options are A 2−8 D 128By using law of exponent: am×an=am+n, here a is called base and m,n are called powers. If base is same then powers are added together. ∴ 2−3×2−5=2−8 Also same number can be expressed in different form that is, 2−3×2−5=(12×12×12)×(12×12×12×12×12) =12×12×12×12×12×12×12×12 =128(by using above law)   Mathematics

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