👤

Sagot :

Bonjour

1. Factoriser

A-16x²-25

A = (4x - 5) (4x + 5)

B=1-9x²

B = - (3x - 1) (3x + 1)

2. Calculer F=2x²-5x

pour x=3

F = 2x² - 5x

F = 2 * 3² - 5 * 3

F = 2 * 9 - 15

F = 18 - 15

F = 3

puis pour x=-2.​

F = 2x² - 5x

F = 2 * - 2² - 5 * - 2

F = 2 * 4 + 10

F = 8 + 10

F = 18.

© 2024 IDNLearn. All rights reserved.