Question

Give me the proper ans...
With Explanation.....

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Answer 1

Answer:

a)y²-(x-3)²

Step-by-step explanation:

(y-x+3)(y+x-3)=y²+yx-3y-xy-x²+3x+3y+3x-9

=y²-x²+6x-9

=y²-(x-3)²

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Answer 2

Answer:

(b)

Step-by-step explanation:

(y-x+3)*(y+x-3)

(y*y)-(x*x)-(3*3)

$y^{2}-x^{2}+9\\ (y^{2}-x^{2})+9\\\\(y-x)^{2} +9$