RS Aggarwal Solutions for Class 8 Chapter 2 Exponents- Powers of exponential expressions with the same base can be simplified by multiplying exponents. An expression with exponent zero is defined as 1. An expression with a negative exponent is defined as a reciprocal. Power of a product of factors is the same as the product of the powers of the same factors. For example, 2 to the 3rd (written like this: 23) means: 2 x 2 x 2 = 8. 23 is not the same as 2 x 3 = 6. Its related concepts like laws of exponents, positive integral exponent of a rational number, negative exponent of a rational number and standard form of a number.