Question

Evaluate 8x2y–2 for x = –1 and y = 2

Answer 1

the answer is 2

8(1)(1/4) =

2

Answer 2

The value of the expression is 2

Explanation:

The given expression is
`8x^2y^(-2)`

Substitute x = –1 and y = 2 in this expression

`8(-1)^2(2)^(-2)`

Now, we know the exponent rule
`x^(-a)=(1)/(x^a)`

`8(-1)^2\cdot(1)/(2^2)`

Now, on simplifying, we get

`8\cdot(1)\cdot(1)/(4)\\\\=8\cdot(1)/(4)\\\\=2`

The value of the expression for the given values of x and y is 2