Find the value of ${2^2}^{ + 2{{\log }_2}3}$
Answer
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Hint: We know that ${\log _a}a$ is equal to $1$. By using this we will add in the power of $2$ with $2$ as making $2{\log _2}2$. Thereafter we will add the log’s value in the power of $2$. Further we will use ${a^{{{\log }_a}x}} = x$ to find the value.
By using some exponent formula:
(i) ${a^{m + n}} = {a^m} \times {a^n}$
(ii) ${a^{{{\log }_a}x}} = x$
Complete step by step solution:
Here, ${2^2}^{ + {{\log }_2}3}$
As we know that ${\log _2}2 = 1$
$ = {2^{2{{\log }_2}2}}^{ + {{\log }_2}3}$
$ = {2^{{{\log }_2}{{(2)}^2}}}^{ + {{\log }_2}3}$ $[m\log a = \log {a^m}]$
$ = {2^{{{\log }_2}4}}^{ + {{\log }_2}3}$
$ = {2^{{{\log }_2}4 \times 3}}$ $[\log m + \log n = \log m \times n]$
$ = {2^{{{\log }_2}12}}$
Using $[{a^{{{\log }_a}x}} = x]$in the above equation, we have
$ \Rightarrow 12$
Therefore,${2^{2 + {{\log }_2}3}} = 12$
Additional Information: Some logarithm formulae are:
(i) ${\log _x}(a \times b) = {\log _x}a + {\log _x}b$
(ii) ${\log _x}\left( {\dfrac{a}{b}} \right) = {\log _x}a - {\log _x}b$
(iii) ${\log _x}({a^b}) = b\,{\log _x}a$
(iv) ${\log _x}(1) = 0$
(v) ${\log _x}({b^k}) = k$
(vi) ${b^{{{\log }_b}}}^{(k)} = k$
Note: In this type of question students should convert the whole value in log form whether it is in base or in power, so use the formula to get the correct answer.
By using some exponent formula:
(i) ${a^{m + n}} = {a^m} \times {a^n}$
(ii) ${a^{{{\log }_a}x}} = x$
Complete step by step solution:
Here, ${2^2}^{ + {{\log }_2}3}$
As we know that ${\log _2}2 = 1$
$ = {2^{2{{\log }_2}2}}^{ + {{\log }_2}3}$
$ = {2^{{{\log }_2}{{(2)}^2}}}^{ + {{\log }_2}3}$ $[m\log a = \log {a^m}]$
$ = {2^{{{\log }_2}4}}^{ + {{\log }_2}3}$
$ = {2^{{{\log }_2}4 \times 3}}$ $[\log m + \log n = \log m \times n]$
$ = {2^{{{\log }_2}12}}$
Using $[{a^{{{\log }_a}x}} = x]$in the above equation, we have
$ \Rightarrow 12$
Therefore,${2^{2 + {{\log }_2}3}} = 12$
Additional Information: Some logarithm formulae are:
(i) ${\log _x}(a \times b) = {\log _x}a + {\log _x}b$
(ii) ${\log _x}\left( {\dfrac{a}{b}} \right) = {\log _x}a - {\log _x}b$
(iii) ${\log _x}({a^b}) = b\,{\log _x}a$
(iv) ${\log _x}(1) = 0$
(v) ${\log _x}({b^k}) = k$
(vi) ${b^{{{\log }_b}}}^{(k)} = k$
Note: In this type of question students should convert the whole value in log form whether it is in base or in power, so use the formula to get the correct answer.
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