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Kay [80]
2 years ago
14

Evaluate 9x^2y^−2 for x = –3 and y = 2. a)9(−6)^0 b)1/144 c)20 1/4 d)324

Mathematics
1 answer:
ziro4ka [17]2 years ago
6 0

Answer:

c)20 1/4

Step-by-step explanation:

9x^{2}y^{-2}

If We replace x by -3 and y by 2 we get  :

9\left( -3\right)^{2}  \left( 2\right)^{-2}

Or we have :

\left( -3\right)^{2}  =9\  \text{and} \  \left( 2\right)^{-2}  =\frac{1}{2^{2}} =\frac{1}{4}

then

9\left( -3\right)^{2}  \left( 2\right)^{-2}=9\times9\times\frac{1}{4} = \frac{81}{4}

on the other hand :

\frac{81}{4} =\frac{80+1}{4} =\frac{80}{4} +\frac{1}{4} =20+\frac{1}{4}=20\frac{1}{4}

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P ( 3, - pi/3 + 2 pi n) or P ( -3 , -pi/3 + pi(2 n +1))

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3 years ago
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Akimi4 [234]
Step 1:
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5 ⟌ 3 3

Step 2:
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Step 3:
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Step 4:
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Step 5:
Move down the 2nd digit of the dividend (3) like this:

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