Question

разложите на множители
a)49-a^2
b)5a(a-1)+3(a-1)

Answer 1

a)49-a^2 = (7-а)(7+а)
b)5a(a-1)+3(a-1) = (а-1)(5а+3)

Answer 2

$7^{2} - a ^{2} \\( a - 1)(5a + 3)$