a)
[tex](x - \sqrt{2} ) {}^{2} = {x}^{2} - 2x \sqrt{2} + 2[/tex]
b)
[tex](x + {y}^{2} )(x - {y}^{2} ) = {x}^{2} - {y}^{4} [/tex]
c)
[tex](7 + \sqrt{3} ) {}^{2} = 7 {}^{2} + 2 \times 7 \times \sqrt{3} + ( \sqrt{3} ) {}^{2} = 49 + 14 \sqrt{3} + 3 = 52 + 14 \sqrt{3} = 2(26 + 7 \sqrt{3} )[/tex]
d)
[tex](2x + 3y)(2x - 3y) = (2x) {}^{2} - (3y) {}^{2} = 4x {}^{2} - 9y {}^{2} [/tex]
Sper că am ajutat! An Nou fericit!
