Find the square of the following numbers: (I)125             (ii)   215               (iii)    1235

Explanation

(1)Square of `125` is `(120+5)^2=(125)^2`
using identity `(a+b)^2=a^2+b^2+2ab`we have,
`=(120)^2+(5)^2+2xx120xx5`
`=14400+25+1200`
`=15625`
(ii)`215^2=(200+15)^2`
`=(200)^2+(15)^2+2xx200xx15`
`=40000+225+6000`
`=46225`
(iii)`(1235)^2=(1200+35)^2`
`=(1200)^2+(35)^2+2xx1200xx35`
`=1440000+1225+84000`
`=1525225`