Question

if 3 X + 2 by x is equal to 7 then 9 x square minus 4 by x square is equals to​

Answer 1

Answer:

-35 or 20

Step-by-step explanation:

3x + 2 / x = 7

3x + 2/x - 7 = 0

(3x^2 + 2 - 7x)x = 0

3x^2 + 2 - 7x = 0

(3x - 1)(x-2) = 0           ...........................(by slitting middle terms or by srhi dhar aacharya formula )

so here,

3x-1 = 0     => x = 1/3

x-2 = 0      => x = 2

so  x = 1/3 or 2

then,

9x^2 - 4/x^2  

9(1/3)^2 - 4/(1/3)^2             ....................where x = 1/3  

1 - 36 = -35      

also,

9x^2 - 4/x^2  

9(2)^2 - 4(2)^2                            ................where x = 2

36  - 16 = 20                    

the answer can be -35 or 20

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