Question

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

Answer 1

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)

Answer 2

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)