IR Academy

What is the Roman numeral for 49?
a) IL
b) XLIX
c) XLIV
d) # #

He said, "I will visit my uncle tomorrow." (Change into indirect speech)

a) He said that he would visit his uncle the next day.
b) He said that he will visit his uncle tomorrow.
c) He said that he would visit his uncle tomorrow.
d) He said that he visited his uncle the next day.

The train is ___ time, so we need to hurry.
a) in
b) at
c) on
d) for

Reasoning

• a² – b² = (a-b)(a+b)

• (a+b)² = a² + 2ab + b²

• (a-b)² = a² – 2ab + b²

• a² + b² = (a-b)² +2ab

• (a+b+c)² = a²+b²+c²+2ab+2ac+2bc

• (a-b-c)² = a²+b²+c²-2ab-2ac+2bc

• a³-b³ = (a-b) (a² + ab + b²)

• a³+b³ = (a+b) (a² – ab + b²)

• (a+b)³ = a³+ 3a²b + 3ab² + b³

• (a-b)³ = a³- 3a²b + 3ab²- b³

Maa🖤🥀