Question

Evaluate 8x2y–2 for x = –1 and y = 2

Answer 1

The answer is 2

8(1)(1/4) =

2

Answer 2

Answer:

The value of the expression is 2

Step-by-step 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 $x^{-a}=\frac{1}{x^a}$

$8(-1)^2\cdot\frac{1}{2^2}$

Now, on simplifying, we get

$8\cdot(1)\cdot\frac{1}{4}\\\\=8\cdot\frac{1}{4}\\\\=2$

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