Question

помогите пж, дам 35 баллов

Answer 1

$1) \: (5a - 11b) \times (5a + 11b) - 25 {a}^{2} = 25 {a}^{2} - 121 {b}^{2} - 25 {a}^{2} = - 121 {b}^{2} \\ b = 0,01 \\ - 121 \times {(0,01)}^{2} = - 121 \times 0,0001 = - 0,0121$
$2) \: (4 {c}^{6} - 7 {d}^{2} ) \times (4 {c}^{6} + 7 {d}^{2} ) = 16 {c}^{12} - 49 {d}^{4}$