Question

=X square there is written at the end
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Answer 1

Hello,

Explanation:

`Using\ the\ formula\ (a+b)(a-b)=a^2-b^2\\p=3x+1\\q=3x-1\\\\p*q=(3x+1)*(3x-1)=9x²-1\\\\p*q+1=9x^2\\\\x^2=(p*q+1)/(9) \\`

Answer 2

see explanation

Explanation:

`(pq+1)/(9)`

=
`((3x+1)(3x-1)+1)/(9)`

=
`(9x^2- 1+1)/(9)`

=
`(9x^2)/(9)`

= x²