Simplify {450 \times450- 150 \times150}/ {450 +150} = ?

RRB Group D Model Paper 1 with solutions

Question : 53 of 100

Marks: +1, -0

Simplify

{450 ×450- 150 ×150}/ {450 +150}

= ?

Solution:

(3) The given expression is

{450 ×450- 150 ×150}/ {450 +150}

{450 ^2- 150^2}/ ({450 +150})

{ ({450 +150}) ({450 -150})}/ {450+150}

= 300
[∵

a^2+b^2

= (a + b) (a - b)]

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