(4.4а+5.2b)²=(4.4a)²+(5.2b)²=19.36a²+27.04b²
(5.2x+3.6y)²=(5.2x)²+(3.6y)²=27.04x²+12.96y²
7+√7*√14+√2=7+7√2+√2=7+8√2