Question

simplify (x+y+3)^2 +(x-y+3)^2​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

(x+y+3)² + (x-y+3)²

(x+y+3)²

= x² + y² + 3² + 2xy + 2y3 + 2x3

= x² + y² + 9 + 2xy + 6y + 6x ----------(1)

(x-y+3)²

= x² + (-y²) + 3² + 2x-y + 2-y3 + 2x3

= x² - y² + 9 -2xy -6y + 6x ------------(2)

(1) + (2)

x² + y² + 9 + 2xy + 6y + 6x + x² - y² + 9 - 2xy -6y +6x

2x² + 18 +12x --------(Ans.)