Question

3) (a - b)(a + b2);
5) (72 - 3y)(7t2 + 3y);​

Answer 1

3)

$(a - b)(a + b {}^{2} ) = a {}^{2} + ab \frac{}{} {}^{2} - ab - b {}^{3}$

5)

$(72 - 3y)(7t2 + 3y) = 1008t + 216y - 42ty - 9y {}^{2}$

Удачи