Question

разложите на множители
a)
${x}^{2} - 49$
b)
$25 {x}^{2} -10xy+{y}^{2}$

Answer 1

a) x² - 49 = x² - 7² = (x - 7)(x + 7)

б) 25x² - 10xy + y² = (5x)² - 2 * 5x * y + y² = (5x - y)² = (5x - y)(5x - y)