Завдання № 1281

Знайди значення виразу:
1) 4x², якщо x = 8; –8;
2) 7a³, якщо a = –2; 2.

Розв'язок:

1) 4 ⋅ 8² = 4 ⋅ 64 = 256
4 ⋅ (-8)² = 4 ⋅ 64 = 256

2) 7 ⋅ (-2)³ = 7 ⋅ (-8) = -56
7 ⋅ 2³ = 7 ⋅ 8 = 56