Question

Помогите решить пожалуйста

Answer 1

1.

$- 3x {}^{2} + 7 = 3 \times ( - 5) {}^{2} + 7 = - 3 \times 25 + 7 = - 75 + 7 = - 68$

2.

$a {}^{8} \times a {}^{16} = a {}^{8 + 16} = a {}^{24}$

$a {}^{16} \div a {}^{4} = a {}^{16 - 4} = a {}^{12}$

$(a {}^{3} ) {}^{5} = a {}^{3 \times 5} = a {}^{15}$

$(2a) {}^{3 } = 8a {}^{3}$

3.

$3a {}^{2} b \times ( - 2a {}^{3} b {}^{4} ) = - 6a {}^{5} b {}^{5}$

$( - 3a {}^{3} b {}^{2} ) {}^{6} = 729a {}^{18} b {}^{12}$