Question

A) Factorise
x2 - 422

Answer 1

★a²-b²=(a+b)(a-b)

So

• x²-42²

a=x ,b=42

• (x+42)(x-42)

Done!

Answer 2

(x + 42)(x - 42)

Explanation:

Keep this in mind :

• a² - b² = (a + b)(a - b)

In this case,

• a = x
• b = 42

So, by factorizing,

• x² - 42² = (x + 42)(x - 42)