Question

помогите пожалуйста номер 699 даю сколько могу​

Answer 1

Ответ:

$1. {y}^{2} - 8y + 16 = (y - 4)^{2} = ( - 4 - 4)^{2}= ( - 8)^{2} = {8}^{2} = 64$

$2. {c}^{2} + 24c + 144 = (c + 12)^{2} = ( - 10 + 12)^{2} = {2}^{2} = 4$

$3.25 {x}^{2} - 20xy + 4 {y}^{2} = (5x - 2y) ^{2} = (5 \times 3 - 2 \times 5.5)^{2} = (15 - 11)^{2} = 16$

$4.49 {a}^{2} + 84ab + 36 {b}^{2} = (7a + 6b)^{2} = (7 \times \frac{8}{7} + 6 \times \frac{17}{6})^{2} = (8 + 17)^{2} = 625$