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Evaluate a2 × a3 × a-5

  • Last Updated : 29 Dec, 2021

Exponents and powers are used to show very large numbers or very small numbers in a simplified manner. For example, if we have to show 2 × 2 × 2 × 2 in a simple way, then we can write it as 24, where 2 is the base and 4 is the exponent. The whole expression 24 is said to be power.

Exponents and Powers

Power is a value or an expression that represents repeated multiplication of the same number or factor. The number of times the base is multiplied by itself is the value of the exponent. For example,

32 = 3 raised to power 2 = 3 × 3 = 9

43 = 4 raised to power 3 = 4 × 4 × 4 = 64

An exponent of a number represents the number of times the number is multiplied by itself. For example, 2 is multiplied by itself for n times,

2 × 2 × 2 × 2 × …n times = 2n

The above expression, 2n, is said as 2 raised to the power n. Therefore, exponents are also called power or sometimes indices.

General Form of Exponents

Exponent represents that how many times a number should be multiplied by itself to get the result. Thus any number ‘b’ raised to power ‘p’ can be expressed as:

bp =  {b × b × b × b × …  × b} p times

Here b is any number and p is a natural number.

  • bp is also called the pth power of b.
  • ‘b’ is the base and ‘p’ is the exponent or index or power.
  • ‘b’ is multiplied ‘p’ times, and thereby exponentiation is the shorthand method of repeated multiplication.

Laws of Exponents

Let ‘b’ is any number or integer (positive or negative) and ‘p1’,  ‘p2’ are positive integers, denoting the power to the bases.

Multiplication Law: It states that the product of two exponents with the same base and different powers equals to base raised to the sum of the two powers or integers.

bp1 × bp2 = b(p1 + p2)

Division Law: It states that if two exponents having the same bases and different powers are divided, then the results will be base raised to the difference between both powers.

bp1 ÷ bp2 = bp1/ bp2 = b(p1 – p2)

Negative Exponent Law: If the base has a negative power, then it can be converted into its reciprocal but with positive power or integer to the base.  

b-p = 1/bp

Basic Rules of Exponents

There are certain basic rules defined for exponents in order to solve the exponential expressions along with the other mathematical operations, for example, if there are the product of two exponents, it can be simplified to make the calculation easier and is known as product rule, let’s look at some of the basic rules of exponents,

Product Rule ⇢ an × am = an + m

Quotient Rule ⇢ an / am = an – m

Power Rule ⇢ (an)m = an × m or m√an = an/m

Negative Exponent Rule ⇢ a-m = 1/am

Zero Rule ⇢ a0 = 1

One Rule ⇢ a1 = a

Evaluate a2 × a3 × a-5

Solution:

Given that : a2 x a3 x a-5

By using product rule

= an × am = an + m

= a2 × a3 × a-5

= a(2 +3) × a-5

= a5 × a-5

= a{5+ (-5)}                         {by product rule}

= a5-5

= a0

Zero Rule ⇢ a0 = 1

= 1 

Similar Questions

Question 1: Simplify (-4x2/y3)3

Solution:

Here one can write above equation as,

= {(-4x2)3/ ( y3)3}

Now,

= {(-4)3 × (x2)3} / (y3)3

= {(-64) × (x2 × 3)} / y3 × 3                    {Power Rule ⇢ (an)m = an × m}

= -64x6/y9

Question 2: What is a9 divided by a3?

Solution:

Here given a9 divided by a3

And use {Quotient Rule ⇢ an / am = an – m}

So write it as a9 / a3

= a9 – 3

= a6

Question 3: Solve (32) × (42)

Solution:

Here when bases are different and powers are same. So as per the product rule we can write as an × bn = (a × b)n

32 × 42

= (3 × 4)2

= 122

= 144

Question 4: What is the product of (7x2y3) and (3x5y8)?

Solution:

The product of (7x2y3) and (3x5y8)

= (7x2y3) × (3x5y8)

= (7x2y3) × (3x5y8)

= 21 x2x5 × y3y8

= 21x2+5 × y3+8                 {Product Rule ⇢ an × am = an + m}

= 21x7y11

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