Question

EFECTUA: (a+b)² - (a-b)²


CALCULA: )√7 + √2) (√7 - √2)


DOY CORONA!

Answer 1

Respuesta:

1. 4ab

2. 5

Explicación paso a paso:

1. (a + b)² - (a - b)² = x² - y² = (x + y)(x - y) = (a + b + a - b)(a + b - a + b)

--- (2a)(2b) = 4ab

2. (√7 + √2) (√7 - √2) = (m + n)(m - n) = m² - n² = (√7²) - (√2)²

--- 7 - 2 = 5