Answer :
It's 1849
I'll explain how I found it without actual multiplication,
[tex] {40}^{2} = 1600 \\ {3}^{2} = 9 \\ 2 \times 40 \times 3 = 240 \\ [/tex]
So,
[tex] {43}^{2} = 1600 + 240 + 9 \\ = 1849[/tex]
Hope this will help....
I'll explain how I found it without actual multiplication,
[tex] {40}^{2} = 1600 \\ {3}^{2} = 9 \\ 2 \times 40 \times 3 = 240 \\ [/tex]
So,
[tex] {43}^{2} = 1600 + 240 + 9 \\ = 1849[/tex]
Hope this will help....