Question

Помогите срочно надо
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Answer 1

Ответ:

$6) \\ a)0.09 {c}^{2} - 100 = (0.3c - 10)(0.3c + 10) \\ b) {p}^{2} + 10p + 25 = {(p + 5)}^{2} = (p + 5)(p + 5) \\ v) {d}^{3} - 27 = (d - 3)( {d}^{2} + 3d + 9) \\ g)3 {a}^{2} - 3 = 3( {a}^{2} - 1) = 3(a - 1)(a + 1)$

${(5y + 2)}^{2} + (9 + 5y)(9 - 5y) = 25 {y}^{2} + 20y + 4 + 81 - 25 {y}^{2} = 20y + 85 = 20 \times \frac{3}{20} + 85 = 3 + 85 = 88$

$(x + 2)( {x}^{2} - 2x + 4) - x(x - 3)(x + 3) = {x}^{3} + 8 - x( {x}^{2} - 9) = {x}^{3} + 8 - {x}^{3} + 9x = 8 + 9x$