Factorise: x2 – 23x + 42 – InterviewSolution

1.	Factorise: x2 – 23x + 42
Answer» First find the two numbers whose sum= -23 and product=42 Clearly, the numbers are 21 and 2 ∴ we get, x² – 23x + 42 = x²– 21x – 2x + 42 = x(x-21) – 2(x-21) = (x-21) (x-2)

Factorise: x2 – 23x + 42

Answer»

First find the two numbers whose sum= -23 and product=42

Clearly, the numbers are 21 and 2

∴ we get, x² – 23x + 42

= x²– 21x – 2x + 42

= x(x-21) – 2(x-21)

= (x-21) (x-2)