Join 60,000+ competitive exam aspirants
The value of x21тАЛ├ЧYтИТ1├Чz32тАЛ, when x=9, Y=3, and z=8 is:
6
18
4
12
4
Express each variable as a power of its prime factors: 9=32 and 8=23. This simplifies the exponents instantly: (32)1/2=31 and (23)2/3=22.
Expression is x1/2├ЧYтИТ1├Чz2/3 with x=9, Y=3, and z=8.
x1/2├ЧYтИТ1├Чz2/3=xтАЛ├ЧY1тАЛ├Ч(3zтАЛ)2
Express each variable as a power of its prime factors: 9=32 and 8=23. This simplifies the exponents instantly: (32)1/2=31 and (23)2/3=22.
Students often struggle with negative exponents (YтИТ1=1/Y) or miscalculate the fractional exponent of 8 as 82 instead of (81/3)2.
Substitute values into the expression
Substitute x=9, Y=3, and z=8 into the expression x1/2├ЧYтИТ1├Чz2/3.
91/2├Ч3тИТ1├Ч82/3
Simplify each component
Evaluate each part: 91/2=9тАЛ=3, 3тИТ1=1/3, and 82/3=(81/3)2=22=4.
3├Ч31тАЛ├Ч4
Final calculation
Multiply the simplified terms: 3├Ч(1/3)├Ч4=1├Ч4=4.
1├Ч4=4
C is correct because substituting x=9, Y=3, and z=8 into the expression simplifies to 3├Ч31тАЛ├Ч4=4.
This concept is fundamental for simplifying complex algebraic expressions and solving logarithmic equations where base conversion is required.