Question

при x=2 y=5

(2x + y)2 - 4x (× + y)

Answer 1

$4x {}^{2} + 2 \times 2xy + y {}^{2} - 4x {}^{2} + 4xy = 4xy+4xy \\ 8 \times 2 \times 5 = 16 \times 5 = 80$

Answer 2

Ответ:

25

Объяснение:

(2х+у)²-4х(х+у)=4х²+4ху+у²-4х²-4ху=у²

у=5 → 5²=25.