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Alja [10]
3 years ago
6

25. Simplify the following expression. Question 25 please

Mathematics
2 answers:
PtichkaEL [24]3 years ago
6 0

I hope this helps you

bearhunter [10]3 years ago
3 0

Answer:

3  -√5

Step-by-step explanation:

(√5 + 1) / (2 + √5)

Multiply top and bottom of the fraction by the conjugate of 2 + √5 which is  2 - √5.

By doing this we rationalise the denominator:

= (√5 + 1 ) *  ( 2 - √5) /  (2 + √5)(2 - √5)

= (√5 + 1 ) *  ( 2 - √5)/ (4 - 2√5 + 2√5 - 5)

= (2√5 - 5 + 2 - √5) / (4 - 5)

= (√5 - 3) / -1

= 3  -√5

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Solve for x.
kirill115 [55]

How to get answer:

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7 0
3 years ago
Read 2 more answers
Find an equation of the tangent line to the curve at the given point.y = 7x2 − x3, (1, 6)y = Correct: Your answer is correct. Il
Nady [450]

Answer:

  y = 11(x -1) +6

Step-by-step explanation:

The slope at the given point is ...

  y' = 14x -3x^2 = 14(1) -3(1^2) = 11

Then the point-slope equation for the line can be written as ...

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7 0
3 years ago
The length of each side of a triangle is increased by 30%. By what percentage is the area increased?
patriot [66]

Answer:

When sides are doubled, the area of new triangle will always be 4 times the original, the change in area will be 3 times. Hence the % change will always be 300% irrespective of the type of triangle.

Step-by-step explanation:


5 0
3 years ago
If the third term in a geometric sequence is 20, and the fifth term in the sequence is 5, what is the ratio (multiplier)?
Talja [164]
Term:    3     4      5
 Value  20    ..      5
            20  20r  20r^2
So 20r^2 = 5
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5 0
3 years ago
When a coin is tossed it is either heads or tails. Suppose heads has a point value of 1 and tails a point value of -1. if the su
zvonat [6]

Answer:

32

Step-by-step explanation:

Totally there are 50 tosses.  

Let the number of tosses which resulted head be x.  

Therefore the number of tosses which resulted tail is 50−x.

We get x×1+(50−x)×(−1)=14

x−(50−x)=14

x−50+x=14

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8 0
3 years ago
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