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
Gnom [1K]
3 years ago
9

BRAINLIEST AVAILABLE!!!! PLEASE HELP ME WITH THIS!!! Thanks to all helpers!!!!!

Mathematics
2 answers:
larisa [96]3 years ago
3 0

Answer: B

<u>Step-by-step explanation:</u>

-10x² + 12x - 9 = 0

a=-10, b=12, c=-9

x = \frac{-b+/-\sqrt{b^{2}-4ac}} {2a}

  = \frac{-12+/-\sqrt{12^{2}-4(-10)(-9)}} {2(-10)}

  = \frac{-12+/-\sqrt{144-360}} {-20}

  = \frac{-12+/-\sqrt{-216}} {-20}

  = \frac{-12} {-20} +/- \frac{\sqrt{-216}} {-20}

  = \frac{3} {5} +/- \frac{6i\sqrt{6}} {-20}

  = \frac{3} {5} +/- \frac{3i\sqrt{6}} {10}

AnnZ [28]3 years ago
3 0

The easiest way to begin this problem is to multiply through by minus one. It will not change the answer. Then use the quadratic formula. It looks like it cannot be factored just by doing it.

Solution

-1(-x^2 + 12x - 9) = 0 * -1

x^2 - 12x + 9 = 0

\text{x = }\dfrac{ -b \pm \sqrt{b^{2} - 4ac } }{2a}

a = 10; b = - 12 ; c = 9

\text{x = }\dfrac{ -(-12) \pm \sqrt{((-12)^{2} - 4*10*9 )} }{2*10}

\text{x = }\dfrac{ (12) \pm \sqrt{(144)-360)}}{20}

\text{x = }\dfrac{ (12) \pm \sqrt{(-216)}}{20}

216 has to be put into prime factors to see how much can come out of the root sign

216:2 * 2 *2 * 3 * 3 * 3

\text{x = }\dfrac{ (12) \pm \2*3sqrt{(-6)}}{20}

x  = 12/20 +/- (6/20)i sqrt(6)

x = 3/5 +/- (3/10)*i*sqrt(6) which is B

B: Answer


You might be interested in
Marlon took a total of 12 pages of notes during 3 hours of class. After attending 4 hours of class, how many total pages of note
elena-14-01-66 [18.8K]
I think it’s 28 I’m not sure
5 0
3 years ago
A cookie recipe calls for 2.5 cups of raisins in order to make 2 dozen
RSB [31]

Answer:7

Step-by-step explanation:

U have to simplfly the thing

7 0
2 years ago
Read 2 more answers
In what time will sum of money double itself at 5% per annum?​
klemol [59]

Step-by-step explanation:

Mr.Josol : what will be the height of the ball after 2 seconds?

8 0
3 years ago
Elena has $240 in the bank. She withdraws $15 each week to pay for her piano lessons. How many lessons can she afford with her s
Ivahew [28]
16 lesson. The equation is 240÷15=16
And like I said 240÷15 is 16
So here I hope it helped You
~jZ
6 0
3 years ago
The null hypothesis claims that the proportion of community college students who work full-time is 0. 45. The alternative hypoth
diamong [38]

The stronger the evidence is against the null hypothesis, the higher the divergence from it.

What do you mean by null hypothesis ?

A statistical hypothesis known as a null hypothesis asserts that no statistical significance can be found in a collection of provided observations. Using sample data, hypothesis testing is performed to judge a theory' veracity. It is sometimes referred to as just "the null," and its symbol is H_{0}. To determine if a theory regarding markets, investing methods, or economies is correct or wrong, quantitative analysts employ the null hypothesis,

The null hypothesis states that the percentage of the population who works full time is 0.45.

As a result, 450 persons who are randomly selected from a population of 1000 work full-time.

A different hypothesis states that the ratio is higher than 0.45.

In the options provided, the proportion for the first option is 300/1000, or 0.3.

In the second choice, 500/1000 equals 0.5

Third alternative: 700/1000 = 0.7

Therefore, the stronger the evidence is against the null hypothesis, the higher the divergence from it.

To learn more about the null hypothesis from the given link.

brainly.com/question/15980493

#SPJ4

4 0
1 year ago
Other questions:
  • Graph each equation by making a table. y = 4
    11·1 answer
  • Use multiplication to find three raios equivalent to 5 : 11.
    14·2 answers
  • Hi guys I need help in these two or one I will post one by one please help me in these pleaseeeee.Im so confuseddddd
    9·2 answers
  • After birth, a baby's weight increased at a steady rate for several weeks.
    6·1 answer
  • The line given passes through the points (0,-3) and (2,3)
    13·1 answer
  • Please help! Attached picture
    11·1 answer
  • Find the approximate area of a circle that has a radius of 14 feet. Round your answer to the nearest hundredth.
    10·2 answers
  • How to write 20,136 in scientific notation
    14·1 answer
  • When constructing an angle bisector of an angle, the first step is to draw
    8·2 answers
  • Help me with this please.
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!