Question

dada a função F(x) = x2 + 7x -1, calcule:

F(- 1/3)=

F (2/3)=

me ajudem por favor!!!

Answer 1

f(x) = x² + 7x - 1

f(-1/3) = (-1/3)² + 7 * (-1/3) - 1
f(-1/3) = 1/9 - 7/3 - 1
f(-1/3) = (1 - 21 - 9) / 9
f(-1/3) = -29/9

f(2/3) = (2/3)² + 7 * (2/3) - 1
f(2/3) = 4/9 + 14/3 - 1
f(2/3) = (4 + 42 - 9) / 9
f(2/3) = 37/9