Question

-9x²+3x-1 limite x tende a dois terços

Answer 1

Observe:
-9(2/3)² + 3(2/3) - 1 = -9(4/9) + 6/3 - 1 = -36/9 + 2 - 1 = - 4 + 2 - 1 =  - 3