Question

ans 3 with method
ana the 3rd with method

Answer 1

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Here is your answer

$9 {x}^{2} + 6x - 1 \\ \\ = (3x) {}^{2} + 2 \times 3x \times 1 - 1 {}^{2}$
It is not the perfect Square as if there is +1 instead of-1 then it will be perfect Square of
$(3x + 1) {}^{2}$
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Answer 2

only 3rd one...?? or anothr also??