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guapka [62]
3 years ago
15

How many x-intercepts are in the quadratic equation y = 7x2 − 2x − 1​

Mathematics
1 answer:
babunello [35]3 years ago
7 0

Answer:

There are 2 x intercepts

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-6 - square root 31, -6 + square root 31

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HELP PLEASE! DUE TMR! Answer whichever ones you want and i can try to deal with the rest. I just have alot of work and need extr
Yuri [45]

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1) 4

2) 0, 2, -10

3) 0, 5, -2

Step-by-step explanation:

1) x³ - 64 = 0

x³ = 64

x = 4

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x³(x² + 10x - 2x - 20) = 0

x³(x(x + 10) - 2(x + 10)) = 0

x³(x + 10)(x - 2) = 0

x = 0, 2, -10

3) x³ - 3x² - 10x = 0

x(x² - 3x - 10) = 0

x(x² - 5x + 2x - 10) = 0

x(x(x - 5) + 2(x - 5)) = 0

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3 years ago
Write two decimals that can be rounded to 2.5
zheka24 [161]
2.48 can be rounded pretty much any number between 2.45 to 2.5
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In which number does the 5 represent a value of 10 times the value represented by 5 in 35,187
Dvinal [7]

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Step-by-step explanation:

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Geometry pls help !!! Find the value of AB.<br> AB = [?]
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Answer:

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Step-by-step explanation:

In the given figure, CD is the diameter and AB is the chord of the circle.

Since, diameter of the circle bisects the chord at right angle.

Therefore, AE = 1/2 AB

Or AB = 2AE...(1)

Let the center of the circle be given by O. Join OA.

OA = OD = 10 (Radii of same circle)

Triangle OAE is right triangle.

Now, by Pythagoras theorem:

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4 0
3 years ago
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