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x - y = √5
x = √11 - y
√11 - y - y = √5
x = √11 - y
-2y = √5 - √11 /:(-2)
y = √11 - √5/2
x = √11 - √11 + √5/2
y = √11 - √5/2
x² - y² = (√11 - √11 + √5/2)² - (√11 - √5/2)² = 7 - 9,75 = -2,75
pzdr ;)