Question

Descompune in factori ireductibili. ​

Answer 1

Răspuns:

a)

$x^{2} - 9 = (x - 3)(x + 3)$

b)

$9x^{2} - 1 = (3x + 1)(3x - 1)$

c)

$4a^{2} - 25 = (2a + 5)(2a - 5)$

d)

$25x^{2} - 16 = (5x + 4)(5x - 4)$

e)

$a^{4} - 81 = (a^{2} - 9)(a^{2} + 9)$

Explicație pas cu pas:

Formula:

$a^{2} - b ^{2} = (a - b)(a + b)$