Question

Using property,find a square of a number ending in 5,the number is 3 square.

Answer 1

$$\begin{gathered} DearStudent, \\ Herethenumberis35 \\ {\left(35\right)}^2={\left(30+5\right)}^2 \\ ={30}^2+2\times 30\times 5+5^2 \\ U\sin gtheformula \\ {\left(a+b\right)}^2=a^2+b^2+2ab \\ wherea=30 \\ b=5 \\ ={\left(30+5\right)}^2 \\ ={30}^2+5^2+2\times 30\times 5 \\ =900+25+300 \\ =1225 \\ Regards. \end{gathered}$$