Question

factories
${a}^{2} - 10a + 21$
​

Answer 1

Step-by-step explanation:

a2-10a+21

=a2-7a-3a+21

=a(a-7)-3(a-7)

=(a-7) (a-3)

Answer 2

Step-by-step explanation:

=a²-(7+3)a+21

=a²-7a-3a+21

=a(a-7)-3(a-7)

=(a-7) (a-3)