Question

$(21.98{)}^2-(25.02{)}^2+(13.03{)}^2=?$

• A. 25
• B. 120
• C. 10
• D. 65
• E. 140

Answer 1

The correct option is A 25

Here, the given expression can also be written as
$(22{)}^2-(25{)}^2+(13{)}^2=?$
or ? =484-625+169
or ? =484+169-625
or ? =28$\approx$25