Question

Pls I need answer to both questions

Answer 1

Heya

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$2 {}^{3x - 6} \times 2 {}^{ - 2 \times 4.3x} = 5 {}^{3} \div 10 {}^{4} \\ \\ \\ \\ taking \: log \: on \: both \: sides \\ \\ \\ log(2) (3x - 6 - 8.6x) = 3 log(5) - 4 \\ \\ \\ \\ - 5.6x = (3 log(5) - 4) \div log(2) \\ \\ \\ 5.6x = (4 - 3 log( 3) ) \div log(2) \\ \\ \\ x =( (4 - 3 \times 0.47) \div 0.303) \div 5.6 \\ \\ \\ x = 1.55$

1)

Let x + 1/x = y

SQUARING BOTH SIDE'S

( x + 1/x )² = y²

=>

x² + 1/x² + 2 = y²

=>

62 + 2 = y²

=>

y² = 64

=>

y = √64

=>

y = 8 or y = -8

So, x + 1/x = 8 or x + 1/x = -8

2)

Answer 2

Answer:

ans of ques 11 is    8

Step-by-step explanation:

( x+1/x )² = x²+ 1/x² + 2 x*1/x

            =    62+2

            = 64

x +1/x=8