Question

pls solve all questions​

Answer 1

(1)

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

(2)

$= 2a + 3b - 3 {( \frac{9}{2} + 3b) }^{2} \\ = 2a + 3b - 3( \frac{81}{4} + 27b + 9 {b}^{2} ) \\ = 2a + 3b - \frac{243}{4} + 81b + 27 {b }^{2} \\ = 2a + 84b + 27 {b}^{2} - \frac{243}{4}$

other question are blurred i couldn't read it ask again.

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mark as brainliest answer.