a^1/2 = √a
(x - y)(x + y) = x² - y²
(x - y)/(√x - √y) = (√x - √y)(√x + √y)/(√x - √y)= √x + √y = x^1/2 + y^1/2
a^1/2 = √a
(x - y)(x + y) = x² - y²
(x - y)/(√x - √y) = (√x - √y)(√x + √y)/(√x - √y)= √x + √y = x^1/2 + y^1/2