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Descompuneti in factori
A)[tex]\frac{x^{2} }{9}[/tex] - [tex]y^{2}[/tex]
E)[tex]\frac{a^{2} }{121}[/tex] -[tex]\frac{16b^{2} }{25}[/tex]


Răspuns :

Răspuns:

Explicație pas cu pas:

x² - y² = (x - y)(x + y)

a)  = (x/3)² - y² = (x/3 -  y)(x/3  +  y)

b) = (a/11)² - (4b/5)² = (a/11  -  4b/5)(a/11  +  4b/5)

x^2/3^2 - y^2 = (x/3+y)(x/3-y)

a^2/11^2 - (4b/5)^2 = (a/11+4b/5)(a/11-4b/5)

Am folosit formula a^2-b^2 = (a+b)(a-b)