Question

calcule ( 2×-1) × (2×+1)=​

Answer 1

Vamos lá,

se o × for vezes será assim,

( 2×-1) × (2×+1)

(−2) × (2)

-4

se o × for x será assim,

( 2x-1) × (2x+1)

(2x + −1) × (2x + 1)

(2x)(2x) + (2x)(1) + (−1)(2x) + (−1)(1)

4x^2 + 2x − 2x − 1

4x^2 − 1