An algebra problem by Mohammad Khaza

Algebra Level 1

if , x = 1 x=1

then, [ x + 1 x ] 10 [{x +\frac{1}{x}}]^{10} =?

2^9 4^5 2^7 4^9

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4 solutions

Munem Shahriar
Jul 5, 2017

Given that,

  • x = 1 x = 1

Now,

= ( 1 + 1 ) 10 = (1 + 1)^{10}

2 10 = 1024 \Rightarrow 2^{10} = 1024

For 4 5 4^5

4 5 = 4 × 4 × 4 × 4 × 4 = 1024 \Rightarrow 4^5 = 4 \times 4 \times 4 \times 4 \times 4 =1024

bro, because of latex i can't post tough solutions. how did you learn latex?

Mohammad Khaza - 3 years, 11 months ago

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You can toggle LaTex(appears when clicked once at your profile picture) to see what's written here. And you can take a look at the note by Daniel Liu

Hope this helps.

Munem Shahriar - 3 years, 11 months ago
Mohammad Khaza
Jul 5, 2017

x=1 . so. (x + 1/x) =2

so, (x + 1/x )^10= 2^10 = 2^( 2 . 5) = 4^5

x = 1 x = 1

= ( x + 1 x ) 10 = ( 1 + 1 1 ) 10 = 2 10 = 4 5 ={ \left( x+\frac { 1 }{ x } \right) }^{ 10 }\\ ={ \left( 1+\frac { 1 }{ 1 } \right) }^{ 10 }\\ ={ 2 }^{ 10 }\\ ={ 4 }^{ 5 } .

If x = 1 {x} = {1} , then we have 2 10 = 1024 {{2}^{10}} = {1024} .

4 5 = ( 2 2 ) 5 = 2 10 4^{5} = (2^{2})^{5} = 2^{10} .

So, the answer is 4 5 {4}^{5} .

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