Question

forma fatorada da expressão a²– 4 é: (A) ( a + 4 ) . ( a − 4 ) (B) ( a − 2 ) . ( − 2 ) (C) ( a − 4 ) . ( a − 4 ) (D) ( a + 2 ) . ( a − 2 )

Answer 1

a² -4

raiz quadrada de a² = a

raiz quadrada de 4 = 2

a²-4 = (a+2)(a-2)