Question

Descompuneti in factori: a) x patrat -8
b) 12-x patrat
c) a patrat -2
d)5-b patrat

Answer 1

a)  x² - 8  = x² -(2√2)² = (x+2√2)(x-2√2) ;

b)  12 - x²= (2√3² - x² = (2√3+x)(2√3-x) ;

c)   a² - 2 = x² - √2² = (a+√2)(a-√2) ;

d)   5 - b² = √5² - b² = (√5+b)(√5-b) ;