Question

Find the value of the following expression for the given values of variables:

$25x^2-12xy+y^2,x=1,y=2$

Answer 1

$$\begin{gathered} 25x^2-12xy+y^2......................\left(i\right) \\ x=1,y=2 \end{gathered}$$

Step 1: Put the value of x and y in expression (i)

=$25{\left(1\right)}^2-12\times 1\times 2+2^2$

=$25-24+4$

=$5$

Hence, the value of the above expression is $5$.