1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
marin [14]
3 years ago
14

Use the quadratic formula to solve 2x^2-5x-5=0 Show all your work

Mathematics
1 answer:
Nataliya [291]3 years ago
3 0

Answer

x = (5 + i sqrt(15))/4 or x = (5 - i sqrt(15))/4

Step-by-step explanation:

Solve for x:

2 x^2 - 5 x + 5 = 0

Hint: | Using the quadratic formula, solve for x.

x = (5 ± sqrt((-5)^2 - 4×2×5))/(2×2) = (5 ± sqrt(25 - 40))/4 = (5 ± sqrt(-15))/4:

x = (5 + sqrt(-15))/4 or x = (5 - sqrt(-15))/4

Hint: | Express sqrt(-15) in terms of i.

sqrt(-15) = sqrt(-1) sqrt(15) = i sqrt(15):

Answer: x = (5 + i sqrt(15))/4 or x = (5 - i sqrt(15))/4

Step-by-step explanation:

You might be interested in
The map below shows the length of a proposed land bridge at Phil Hardberger Park. The length of the land bridge is represented b
Tamiku [17]

Answer:

A; the actual length of the land bridge from P to H is 50 yards

Step-by-step explanation:

Here in this case, given the coordinates of P and H, we want to calculate the actual length of the distance between the two points.

Mathematically, to calculate this distance, we make use of the distance formula;

D = √(x2-x1)^2 + (y2-y1)^2

In this case, (x1,y1) = (2,55) while (x2,y2) = (32,15)

Substituting these values

D = √(32-2)^2 + (15-55)^2

D = √(-30)^2 + (-40)^2

D = √(900 + 1600)

D = √(2,500)

D = 50 units

Now, we know that each units represent 1 yard, thus 50 units will represent 50 * 1 = 50 yards

8 0
3 years ago
Assume that y varies inversely as x. If, y, is 2.4 when x = 5, which is an equation that relates x and y?
Firlakuza [10]
K=y•x
Inverse means 1/variable
y=k•1/x
y=k/x
k=y•x

x=5
y=2.4
k=2.4 • 5
k=12

Answer is:

y=12/x

Good luck.
4 0
3 years ago
Find the value of each variable.
lana66690 [7]

Answer:

x=7 y=12.124

Step-by-step explanation:

hope this helps

6 0
3 years ago
Which factor is important to consider when building a savings fund for planned,long term needs ?
netineya [11]

Answer:

Principal amount of investment.

Interest rate.

Simple or compound interest.

Time to hold the investment.

Step-by-step explanation:

There are several factors to consider when building a savings fund for planned long term needs.

First of all, we have to consider the amount of principal money we can invest in. It may be a one-time investment or a systematic investment plan. I case of a one-time investment we can easily calculate the investment amount but in case of monthly or yearly investment, we have to be sure that we will be able to invest the amount for the said period of time.

Second is the interest rate that the fund is giving i.e. APR of the fund. Again, take care to identify whether it is a simple interest or compound interest. Obviously the compound interest is better than simple interest as it gives more interest.

The third is the time for which you can hold the money without withdrawal. (Answer)

4 0
4 years ago
Read 2 more answers
1 - 2sin^2(pi/3) = _____ <br> cos pi/6 <br> sin pi/6 <br> cos 2pi/3<br> sin 2pi/3
ZanzabumX [31]

Apply the cosine double angle identity to get:

Cos 2PI/3

6 0
3 years ago
Other questions:
  • Mark left 3/8 of pizza in the refrigerator. On friday he ate 1/2 if what is left of the pizza. What fraction of the entire pizza
    12·2 answers
  • On average,Anna can drive 31 miles on every gallon of gasoline. If you fills up her tank for $2.19 per gallon, how much will it
    10·2 answers
  • Witch of theese is a composite number 61,71,81,101?
    6·1 answer
  • Plz help geometry question is below, asap
    10·1 answer
  • If two points known on the line A B in the coordinate plane is (7,15) and (18,42), calculate the slope of the line AB and the le
    14·1 answer
  • Need this today, thanks!
    9·1 answer
  • Matthew had 11.9 meters of string. He cut the string into pieces that were each 0.34 meter long.
    15·2 answers
  • HELP!!! Need to finish this today! Overdue! Will mark you branliest...your help will be greatly appreciated :)
    9·2 answers
  • A 2-kilogram bag of flour costs $4.70. What is the unit price?
    7·1 answer
  • I will give Brainliest two whoever answers 1st (if correct)
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!