Question

Evaluate 9x^2y^-2 for X=-3 and y=2

Answer 1

9*(-3)^2*(2)^-2
9*9*2^-2
81*2^-2
81*(1/4)
20.25

Final answer: 20.25 or 81/4

Answer 2

Answer:

so if its 81/4 the real answer would be 20 1/4

Step-by-step explanation:

Step 1 Find Whole Number

Calculate out how many times the denominator goes into the numerator. To do that, divide 81 by 4 and keep only what is to the left of the decimal point:

81 / 4 = 20.2500 = 20

Step 2 Find New Numerator

Multiply the answer from Step 1 by the denominator and deduct that from the original numerator.

81 - (4 x 20) = 1

Step 3 solution

Keep the original denominator and use the answers from Step 1 and Step 2 to get the answer. 81/4 as a mixed number is:

20 1/4