
To Simplify:
2√2+2√5√5+√2

Answer to Problem 44PPS
2
Explanation of Solution
Given Information:
Given expression to simplify:
2√2+2√5√5+√2
Concept Used :
- Definition of nth root:
- Words : For any real numbers a and b , and any positive integer n , if an=b then a is the nth root of b . That is a=n√b
- n√bHereb=radicandn=index√=radicalsign
Product Property of Radicals: For any real number a and b and any integer n > 1 , n√ab=n√a⋅n√b , if n is even and a & b are both nonnegative or if n is odd.
- Quotient Property of Radicals:
- Rationalizing the denominator :
- Like radical expressions : If the radicals have both the index and radicand identical , then they are like radicals.
- In order to add or subtract , the radicals must be like radicals.
For any real numbers a and b≠0 and any integern >1,n√ab=n√an√b,if all roots are defined.
To eliminate radicals from a denominator or fractions from a radicand , use this process.
To rationalize a denominator, multiply the numerator and denominator by a quantity so that the radicand has an exact root.
Calculation:
- Given 2√2+2√5√5+√2
- 2√2+2√5√5+√2=2√2+2√5√5+√2⋅√5−√2√5−√2.................................[Rationalizing the denominator]=(2√2+2√5)(√5−√2)(√5+√2)(√5−√2)=2√2⋅√5−2√2⋅√2+2√5⋅√5−2√5⋅√2(√5)2−(√2)2..[Distributive property & (a+b)(a-b)=a2−b2]=2√10−4+10−2√105−2=(2−2)√10+63..........................................[Subtracting like radicals]=63=2
- So, the solution is 2
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