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stepladder [879]
3 years ago
7

How to tell if a complex solution is real or imaginary?

Mathematics
2 answers:
skad [1K]3 years ago
8 0

Answer:

If a parabola has a descrimant is less than zero its solution is imaginary, if it is equal to 0 it has one solution and if it is greater than 0 it has 2 solutions. The discramanant can be written as b^2 - 4ac and it is the area under the square root in the quadratic equation.

Step-by-step explanation:

fgiga [73]3 years ago
4 0

Answer:

The expression b2 − 4ac is called the discriminant, and can be used to determine whether the solutions are real, repeated, or complex: 1) If the discriminant is less than zero, the equation has two complex solution(s). 2) If the discriminant is equal to zero, the equation has one repeated real solution(s).

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The surface area of a sphere is 275.56 1 cm? What is the approximate volume of the sphere?
skad [1K]

Answer:

V=430.19\ cm^3  or  V=136.93\pi\ cm^3

Step-by-step explanation:

The surface area of a sphere is:

A_s=4\pi r^2

Where r is the radius of the sphere

In this case we know that A_s = 275.561\ cm^2

So

4\pi r^2=275.561

We solve the equation for r

4\pi r^2=275.561\\r^2 = \frac{275.561}{4\pi}\\\\r=\sqrt{ \frac{275.561}{4\pi}}\\\\r=4.683\ cm

Now we know the radius of the sphere.

The volume of a sphere is:

V=\frac{4}{3}\pi r^3

We substitute the value of the radius in the formula

V=\frac{4}{3}\pi (4.683)^3

V=430.19\ cm^3

5 0
4 years ago
7 x (-3) x (-12)^2=? A. -84 B. -48 C. 84 D. 48
Andre45 [30]

━━━━━━━☆☆━━━━━━━

▹ Answer

B. -48

▹ Step-by-Step Explanation

Distribute each number to factor so you can solve

Hope this helps!

- CloutAnswers ❁

Brainliest is greatly appreciated!

━━━━━━━☆☆━━━━━━━

6 0
4 years ago
Read 2 more answers
Heeeeeeeeeeeeeeeeeeeeeeelp asap ill give freaking 15 points and please give a good explanation.
swat32

Answer:

4x - 12

Step-by-step explanation:

Expand 8 - 4(-x + 5) as follows:

              8 + 4x - 20

               4x - 12    (First answer is the correct one)

6 0
3 years ago
Read 2 more answers
a company's stock begins the week with a price of $43.85 per share. The price changes by $2.70 each day for 2 days. Then the pri
Inessa05 [86]
43.85 + (2*2.70) - (2*1.10) - 4.45 = $42.60

Or more simply 43.85 + 2.70 + 2.70 - 1.10 - 1.10 - 4.45 = $42.60
5 0
4 years ago
Read 2 more answers
1 pts
LuckyWell [14K]
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3 years ago
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