Question

1. Efectuati:
(2x-1) la a 2 a
(2x+1) la a 2 a
(x-2) la a 2 a
(x+2) la a 2 a
(x-2) (x+2)
(2x-1( ( 2x+1

Dau coroana

Answer 1

(2x-1)² = 4x²-4x+1

(2x+1)² = 4x²+4x+1

(x-2)² = x²-4x+4

(x+2)² = x²+4x+4

(x-2)(x+2) = x²-4

(2x-1)(2x+1) = 4x²-1

Formule:

(a+b)² = a²+2ab+b²

(a-b)² = a²-2ab+b²

(a+b)(a-b) = a²-b²