Question

Efectúe A = (m+1)(m-1)-m2 +1

Answer 1

A = (m + 1)(m - 1) - m² + 1

A = (m)² - (1)² - m² + 1

A = m² - 1 - m² + 1

A = m² - m² - 1 + 1

[Se tachan los m² y 1, porque hay mismos valores con diferentes signos]

∴ A = 0

Answer 2

A = (m+1)(m-1)-m² +1

Aplicar diferencia de cuadrados en (m+1)(m-1)

(a + b) · (a − b) = a² - b²

A = (m+1)(m-1)-m² +1

A = m²- 1 - m²+1

A = 0

Saludos...