Question

Помогите решить пять примеров

Answer 1

Объяснение:

1.

а)

${(2a - 1)}^{2} = 4 {a}^{2} - 4a + 1$

б)

${(x + 3y)}^{2} = {x}^{2} + 6xy + 9 {y}^{2}$

в)

$(7 - x)(7 + x) = 49 - {x}^{2}$

2.

а)

${(x + 5)}^{2} - 5x(2 - x) = {x}^{2} + 10x + 25 - 10x + 5 {x}^{2} = 6 {x}^{2} + 25$

б)

$16y + 2 {(y - 4)}^{2} = 16y + 2( {y}^{2} - 8y + 16) = 16y + 2 {y}^{2} - 16y + 32 = 2 {y}^{2} + 32$