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photoshop1234 [79]
3 years ago
9

If x=3+root8 and y =3- root 8 find 1/x^2+1/y^2

Mathematics
1 answer:
KonstantinChe [14]3 years ago
3 0

Answer:

34

Step-by-step explanation:

x=3+√8

y =3-√8

now,

1/x^2+1/y^2

=1/(3+√8)² + 1/(3-√8)²

= [(3-√8)²+(3+√8)²] / (3+√8)²(3-√8)²            [L.C.M  = (3+√8)²(3-√8)² ]

=[(3-√8+3+√8)²-2(3-√8)(3+√8) ] / [(3+√8)(3-√8)]²  

=[6²-2.(3²-√8² )] / (3²-√8²)²                 [ a²+ b²=(a+b)²-2ab]

=[36-2(9-8) ]/ (9-8)²

=[36-2.1] / 1²

=34

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Keith_Richards [23]

Answer:

It is not possible for Alice to score an average of 75% because what she needs to score in the fifth exam exceeds the maximum possible score.

Step-by-step explanation:

She scored an average 68% in all 4 exams.

This means; (68% + 68% + 68% + 68%)/4

Now, a fifth exam is added and we want to know if her average can now be 75%.

Thus, let the score in the 5th exam be x and we now have;

(68% + 68% + 68% + 68% + x)/5 = 75%

Multiply both sides by 5 to get;

(68% + 68% + 68% + 68% + x) = 375%

272% + x = 375%

x = 375% - 272%

x = 103%

The maximum score is 100% and therefore it is impossible for her to score 103%. Therefore it is not possible for Alice to score an average of 75%

7 0
3 years ago
I have done a and b but I am really struggling on C
Rashid [163]
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3 0
3 years ago
If Kaylee was 18 and Lylah was 45 how many years younger would Kaylee be??
SVETLANKA909090 [29]
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You would subtract her age from Lylah's.

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Kaylee was 27 years younger than Lylah.

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5 0
3 years ago
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Answer: 500 g of candy in each bowl

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Answer: 500 g of candy in each bowl

<h2><em>Spymore</em></h2>
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3 years ago
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Pie

Answer:

0.16

Step-by-STep explanation:

0.16

3 0
3 years ago
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