Given,

x² – 10x + 24

Now first find the numbers whose-

Sum = - 10 and

Product = 24

Required numbers are 6 and 4,

So we get;

x² – 10x + 24

= x² – 6x – 4x + 24

= x(x – 6) – 4(x – 6)

= (x – 6)(x – 4)