Question

Evaluate 10x2y-2 for x = -1 and y = -2.

5/8

2 1/2

10(2)^0

40

Answer 1

`2(1)/(2)`

Explanation:

we have

`10x^(2) y^(-2)`

we know that

`10x^(2) y^(-2)=10(x^(2))/(y^(2))`

Substitute the value of x=-1 and y=-2 in the expression

`10((-1)^(2))/((-2)^(2))`

`10(1)/(4)`

`(10)/(4)`

Simplify

`(5)/(2)=2(1)/(2)`