P.S.: ^2 inseamna ridicat la a doua. Ex: 2^2 e 2 ridicat la puterea a doua adica 4.
a) (√2x - 3)(√2x + 3) =
(√2x)^2 - 3^2 = 2x^2 - 9
b) (x√6 - √5)(x√6 + √5) =
(x√6)^2 - √5^2 = 6x^2 - 5
c) (x√2 - 1)(x√2 + 1) =
(x√2)^2 - 1^2 = 2x^2 - 1
d) (x^2√3 - √7)(x^2√3 +√7) =
(x^2√3)^2 - √7^2 = 3x^4 - 7
e) (2√5 - x√3)(2√5 + x√3) =
(2√5)^2 - (x√3)^2 = 20 - 3x^2
f) (3 + √2x)(3 - √2x) =
3^2 - (√2x)^2 = 9 - 2x^2
g) (2x√3 - 3√2)(2x√3 + 3√2) =
(2x√3)^2 - (3√2)^2 = 12x^2 - 18
h) (2√2x - √5)(2√2x + √5) =
(2√2x)^2 - (√5)^2 = 8x^2 - 5
