Question

1. Efectuați: a) (x + y)²; d) (b-2)²; b) (a-3)²; (3-x)²; c) (x+a)²; f) (4+ a)².
Urgent am nevoie, va rog!!!!​

Answer 1

$a) \: (x + y) {}^{2} = x {}^{2} + 2xy + y {}^{2} \\ d) \: (b - 2) {}^{2} = b {}^{2} - 4b + 4 \\ b) \: (a - 3) {}^{2} = a {}^{2} - 6a + 9 \\ e) \: (3 - x) {}^{2} = 9 - 6x + x {}^{2} \\ c) \: (x + a) {}^{2} = x {}^{2} + 2ax + a {}^{2} \\ f) \: (4 + a) {}^{2} = 16 + 8a + a {}^{2}$