Question

The value of (x2-8y), when x=2, y=-1 is​

Answer 1

Here we are given an expression x² - 8y

The values of x and y are given

x = 2 and y = -1

We will put these values in the expression

x² - 8y = ( 2 )² - 8 ( -1 )

           = 4 + 8

           = 12

Hence, the value of x² - 8y will be 12

Answer 2

As per the data given in the question,

We have to determine the value of the expression.

As per question,

It is given that,

$(x^2-8y)$

If the value of $x = 2\:and\:y = -1$

So, in order to determine the value of given expression,

We will put the value of x and y in the expression.

We will get it as,

$(x^2-8y) = 2^2-(8\times -1)\\4-((-8)\\4+8 = 12$

Hence, value of the given expression when "x = 2 and y = -1" will be 12.