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# Find a and b.

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$$12^\frac{3}{4}\times \sqrt[a]{12^b} = 12^\frac{3}{2}\times \sqrt{12^7}$$

Guest Mar 23, 2017
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#1
+6925
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$$12^{\frac{3}{4}}\times \sqrt[a]{12^b}=12^{\frac{3}{2}}\times \sqrt{12^7}\\ 12^{\frac{3}{4}+\frac{b}{a}}=12^{\frac{3}{2}+\frac{7}{2}}\\ \dfrac{3}{4} + \dfrac{b}{a}=5\\ \dfrac{b}{a} = 4\dfrac{1}{4} = \dfrac{17}{4}$$

b = any multiple of 17 and a = the corresponding multiple of 4.

That means when b = 2 x 17 = 34, a = 2 x 4 = 8.

i.e. a = 4k, b=17k, where k is a positive integer.

You cannot solve for a and b seperately unless you have 2 equations.

MaxWong  Mar 23, 2017
#2
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b=17

a=4

Guest Mar 23, 2017
#3
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You are not quite correct.

a and b does not NECESSARILY equal 4 and 17. It can be any multiple of the numbers.

MaxWong  Mar 24, 2017

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