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Svetradugi [14.3K]
3 years ago
15

The 1st flat-bar, or cross, or other operator means: -9-(-7)

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

-9-(-7)

-9--7

-9+7

7-9

-2

---

hope it helps

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Determine between which consecutive integers the real zeros of y(x) = x2 - 4x – 2 are located.
Sholpan [36]

Answer:

The zeros are x1=4.45 and x2=-0.45.

x1 is between 4 and 5.

x2 is between -1 and 0.

Step-by-step explanation:

We have the function:

y(x) = x2 - 4x-2

As this is a quadratic function, we can calculate the zeros of the function with the quadratic equation:

x_{1,2}=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\\\\\x=\dfrac{-(-4)\pm\sqrt{(-4)^2-4\cdot 1\cdot(-2)}}{2\cdot 1}\\\\\\x=\dfrac{4\pm\sqrt{16+8}}{2}\\\\\\x=\dfrac{4\pm\sqrt{24}}{2}\\\\\\x=\dfrac{4\pm4.9}{2}=2\pm2.45\\\\\\x_1=2+2.45=4.45\\\\x_2=2-2.45=-0.45

The zeros are x1=4.45 and x2=-0.45.

x1 is between 4 and 5.

x2 is between -1 and 0.

7 0
3 years ago
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What is the square root of -1?
NeX [460]

Answer:

i

Step-by-step explanation:

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A card is drawn from a standard deck of playing cards. What is the probability of drawing a 2 or a queen
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3 years ago
-3x^2 + 2y^2 + 5xy - 2y + 5x^2 - 3y^2<br><br> x = 2 , y = -1
rewona [7]
X=2 Y=-1 plug them into the equation
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36+4-10+2+100+9

40-10+2+100+9

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What is the distance between the two points shown?
bonufazy [111]
The distance is (-4, 4)

Explanation: I moved down 4 cubes (negative) and moved right 4 cubes (positive).

I hope I am right :)
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