Question

pe 14 si acord 10 pct si coroana..ms cat mai rpd

Answer 1

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

Answer 2

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