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Surds and indices Practice Questions & Answers

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If $3^{x+3}=27^{2x+1}$ , then the value of x is

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If $3^{x+3}=27^{2x+1}$ , then the value of x is
1). 7
2). 3
3). -2
4). 1

2 vote

If $27^{2x-1}=(243)^{3}$ , then the value of x is

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If $27^{2x-1}=(243)^{3}$ , then the value of x is
1). 3
2). 6
3). 7
4). 9

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Simplify ; $\left[\sqrt[3]{\sqrt[6]{5^{9}}}\right]^{4}$

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Simplify ; $\left[\sqrt[3]{\sqrt[6]{5^{9}}}\right]^{4}$
1). $5^{2}$
2). $5^{4}$
3). $5^{8}$
4). $5^{12}$

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If x y are rational numbers and $\frac{5+\sqrt{11}}{3-2\sqrt{11}}$= $x+y\sqrt{11}$ The values of x and y are

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If x y are rational numbers and $\frac{5+\sqrt{11}}{3-2\sqrt{11}}$= $x+y\sqrt{11}$ The values of x and y are
1). x=$\frac{-14}{17}$ , y=$\frac{-13}{26}$
2). x=$\frac{4}{13}$ , y=$\frac{11}{17}$
3). x=$\frac{-27}{25}$ , y=$\frac{-11}{37}$
4). x=$\frac{-37}{35}$ , y=$\frac{-13}{35}$

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If x = $\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}$, y = $\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}$, then (x + y) equals :

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If x = $\frac{\sqrt{5}+\sqrt{3}}{\sqrt{5}-\sqrt{3}}$, y = $\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}$, then (x + y) equals :
1). 8
2). 16
3). $2\sqrt{5}$
4). $2(\sqrt{5}+\sqrt{3})$