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4 years ago

The product of 2 numbers is -33 whereas their difference is -12. Find the numbers. Hint: There are 2 PAIRS of numbers...

Mathematics

2 answers:

weqwewe [10]4 years ago

5 0

Answer:

Let the two nos. Be x and y

xy = -32

x - y = -12

(x-y)^2 = (x+y)^2 - 4xy

144 = (x+y)^2 + 128

16 = (x+y)^2

Therefore x+y = +4, -4

When x+y = +4, x-y = -12

x = -4, y = 8

When x+y = -4, x-y = -12

x= -8, y = 4

Hope this helps!

d1i1m1o1n [39]4 years ago

4 0

Answer:

Step-by-step explanation:

Numbers : 8 or -8 4, or -4

-8*4=-32 -4+8= -32

-8-4= -12 -4-8 = -12

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The arc of the parabola y = x^2 from (3,9) to (4,16) is rotated about the y-axis. Find the area of the resulting surface. Please

Hitman42 [59]

Answer:

156.5

Step-by-step explanation:

Thinking process:

The area can be calculated using the formula:

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We let the substitution take place.

Therefore, we let $u = 1 + 4x^{2}$

Thus, $du = 8dx.$

So,

$xdx = \frac{1}{8}du$

Also, the interval of the integration changes to [ 37, 65]

Thus,

$S = \int\limits^4_3 {2\pi \sqrt{1+4x^{2} } } \, dx \\= \int\limits^65_35 {2\pi \sqrt{\frac{1}{8}u } } \, dx$

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8 0

3 years ago

Help me please!!!! The question is in the picture^^^

Aleksandr [31]

Answer:

7,173

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Step-by-step explanation:

Within the question it gives two examples.

x = 0 corresponds to 2000

x = 1 corresponds to 2001

If you pay close attention the x-value is always the same as the last digits in the year. So with 2007 the last digit is 7, which then leads us to determine that

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3 years ago

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Ivenika [448]

Answer:

3.5 min

Step-by-step explanation:

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3 years ago

Which equation models the problem below if c represents the number of puppies whose eyes are closed?

True [87]

First you must take into account the variable that is being defined for this case:
c = represents the number of puppies whose eyes are closed.
We can then write the following equation:
15 = 11 + c
Rewriting the equation:
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Clearing c:
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c = 4
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Answer:
11 + c = 15
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3 years ago

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3 years ago

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