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sukhopar [10]
4 years ago
15

2x²-2x-5=0 solve it using Δ=b²-4ac

Mathematics
1 answer:
Murljashka [212]4 years ago
6 0

Answer:

44

Step-by-step explanation:

2x² - 2x - 5 = 0 is written in standard form ax^2 + bx + c = 0.

By looking at the formula, we can see that;

a = 2

b = -2

c = -5

Now, we can substitute these variables into the equation we are given and solve.

= b² - 4ac

= -2^2 - 4(2)(-5)

= 4 - 4(-10)

= 4 - (-40)

= 4 + 40

= 44

Best of Luck!

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The table of values and their graph show above a straight line that passes through the origin. This indicates that the relationship between the two currencies is in direct proportion. Think about what this means in real terms – if you have ten times more dollars than another person, when you both exchange your money, you will still have ten times more money. Notice also that the graph passes through the origin; this makes sense as if you have no dollars you will get no pounds!

We can express these relationships algebraically as well as graphically.

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Step-by-step explanation:

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Find how many gallons it would take to travel 240 miles
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HELP MEEEEEEEEEEEEE PLZZZZZZZZZZZZ
Leona [35]

Let's say we wanted to subtract these measurements.

We can do the calculation exactly:

45.367 - 43.43 = 1.937

But let's take the idea that measurements were rounded to that last decimal place.  

So 45.367 might be as small as 45.3665 or as large as 45.3675.

Similarly 43.43 might be as small as 43.425 or as large as 43.435.

So our difference may be as large as

45.3675 - 43.425 = 1.9425

or as small as

45.3665 - 43.435 = 1.9315


If we express our answer as  1.937 that means we're saying the true measurement is between 1.9365 and 1.9375.  Since we determined our true measurement was between 1.9313 and 1.9425, the measurement with more digits overestimates the accuracy.

The usual rule is to when we add or subtract to express the result to the accuracy our least accurate measurement, here two decimal places.

We get 1.94 so an imputed range between 1.935 and 1.945.  Our actual range doesn't exactly line up with this, so we're only approximating the error, but the approximate inaccuracy is maintained.


7 0
3 years ago
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Recall the equation for a circle with center ( h , k ) and radius r . At what point in the first quadrant does the line with equ
butalik [34]

Answer: The required point = (1.857,8.643)

Step-by-step explanation:

Equation of circle with center (h,k) and radius r: (x-h)^2+(y-k)^2=r^2

Given: Radius = 5 , center = (0,4)

Eqation of circle: (x-0)^2+(y-4)^2=5^2

x^2+(y-4)^2=25

x^2+(2.5x+4-4)^2=25  [Using equation y = 2.5 x + 4  ]

x^2+(2.5x)^2=25

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y= 2.5(1.857)+4

=8.6425

Hence, the required point = (1.857,8.643)

7 0
4 years ago
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