Question

розкласти число на множники:
1)-25a²+x²y²
2)16b-b³
3)81m²-(m+9m)²
4)y⁴-16​

Answer 1

1.

$- 25a {}^{2} + x {}^{2} y {}^{2} = x {}^{2} {y {}^{} }^{2} - 25a {}^{2} = (xy - 5a) \times (xy - + 5a)$

2.

$16b - b {}^{3} = b \times (16 - b {}^{2} ) = b \times (4 - b) \times (4 + b)$

3.

$81m {}^{2} - (m + 9m) {}^{2} = 81m {}^{2} - (10m) {}^{2} = 81m {}^{2} - 100m {}^{2} = - 19m {}^{2}$

4.

$y {}^{4} - 16 = (y {}^{2} - 4) \times (y {}^{2} + 4) = (y - 2) \times (y + 2) \times (y {}^{2} + 4)$

Надеюсь