Question

1) 3x(x²+7x-1) 2) 5x(x-y)-5x 3) 5x(x²+2x-3) 4) 7x(x+y)-7x²

Answer 1

1)
$3 {x}^{3} + 21x {}^{2} - 3x {}^{2}$
2)
$5x {}^{2} - 5xy - 5x$
3)
$5x {}^{3} + 10x {}^{2} - 15x$
4)
$7x {}^{2} + 7xy - 7x {}^{2}$
ВРОДЕ ТАК

Answer 2

У меня так получилось.

Answer 3

1. 3x(x²+7x-1) = 3x³ + 21x² - 3x

2. 5x(x-y)-5x = 5x² - 5xy - 5x

3. 5x(x²+2x-3) = 5x³ + 10x² - 15x

4. 7x(x+y)-7x² = 7x² + 7xy - 7x² = 7xy