Question

solve this

fast please​

Answer 1

Step-by-step explanation:

22 64838363638

238494959588

Answer 2

Answer:

$x=\frac{a^{2} -1}{2a}$

Step-by-step explanation:

$a=x+\sqrt{x^{2}+1 } \\a-x=\sqrt{x^{2}+1 }\\(a-x)^{2} ={x^{2}+1 }\\\\a^{2} +x^{2} -2ax = {x^{2}+1 }\\\\a^{2} - 2ax = 1 \\2ax = a^{2} - 1\\x = \frac{a^{2}-1 }{2a}$