f(x) = x³ - 2ax + 5
1) f( - 1) = - 3
- 3 = (- 1)³ - 2a * (- 1) + 5
- 3 = - 1 + 2a + 5
2a = -7
a = - 3,5
2) f(x) = x³ - 2x * (- 3,5) + 5
f(x) = x³ + 7x + 5
f(- 2) = (-2)³ + 7 * (- 2) + 5 = - 8 - 14 + 5 = - 17
Ответ : f(- 2) = - 17
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Verified answer
Verified answer
f(x) = x³ - 2ax + 5
1) f( - 1) = - 3
- 3 = (- 1)³ - 2a * (- 1) + 5
- 3 = - 1 + 2a + 5
2a = -7
a = - 3,5
2) f(x) = x³ - 2x * (- 3,5) + 5
f(x) = x³ + 7x + 5
f(- 2) = (-2)³ + 7 * (- 2) + 5 = - 8 - 14 + 5 = - 17
Ответ : f(- 2) = - 17