Question

Sendo A=2x+5, B=4-5x e C=4x-1,determine C²-3A.2B

Answer 1

A = 2x + 5 B = 4 - 5x C = 4x - 1

C²- 3A × 2B = (4x - 1)² - 3 × (2x + 5) × 2 × (4 - 5x) → 16x² - 4x - 4x + 1 - 6x + 15 × 8 - 10x → 16x² - 4x - 4x + 1 - 6x + 120 - 10x → 16x² - 24x + 121

Espero ter ajudado!!!