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stepan [7]
3 years ago
12

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

Mathematics
2 answers:
Sergeu [11.5K]3 years ago
6 0
9*(-3)^2*(2)^-2
9*9*2^-2
81*2^-2
81*(1/4)
20.25

Final answer: 20.25 or 81/4
yuradex [85]3 years ago
5 0

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

     

     

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Step-by-step explanation:

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21 = 3 * 7

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