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
arsen [322]
3 years ago
12

2x squared + 9x=-5 i need to solve for x

Mathematics
1 answer:
In-s [12.5K]3 years ago
3 0
2x^2+ 9x=-5 \\ \\2x^2 + 9x+5 =0 \\\\a=2, \ \ b=9 , \ \ c=5 \\\\\Delta =b^2-4ac = 9^2 -4\cdot 2\cdot 5 =  81-40=41 \\ \\x_{1}=\frac{-b-\sqrt{\Delta} }{2a}=\frac{-9-\sqrt{41}}{2\cdot 2 }=\frac{-9-\sqrt{41}}{ 4 }\\\\ x_{2}=\frac{-b+\sqrt{\Delta} }{2a}=\frac{-9+\sqrt{41}}{2\cdot 2 }=\frac{-9+\sqrt{41}}{4 }
You might be interested in
The first T-shirt you buy costs $7, and every additional shirt costs only $5. Let f(n) be the total cost of n shirts. F is a seq
Zina [86]

Answer:

f(n) = 2 + 5n. This is an arithmetic sequence.

Step-by-step explanation:

f(1) = 7

f(2) = 7 + 5

f(3) = 7 + 5 + 5 = 7 +10

f(4) = 7 + 5 + 5 + 5 = 7 + 15

In general,

f(n) = 7 + 5(n -1 )

        = 7 + 5n - 5

        = 2 + 5n

We have the sequence 7, 12, 17, 22, 27 …

This is an arithmetic sequence, because it is a sequence of numbers in which the <em>common difference</em> between consecutive terms is 5.

6 0
3 years ago
At a school picnic, your teacher asks you to mark a field every 10 yards so students can play football. The teacher accidentally
Oxana [17]
Approximately 9 meters are in 10 yards, (as there is approximately 1 meter in a yard, .9144 to be exact.) 
3 0
3 years ago
Michaela pays her cell phone service provider $49.95 per month for 500 minutes. any additional minutes used cost $0.15 each. in
True [87]
75 additional minutes were used


$61.20-$49.95=$11.25

$11.25/$0.15=75 additional minutes
4 0
3 years ago
Rewrite the expression in the form 6^n 6^-6/6^-5
oee [108]

Answer:

6^-1

Step-by-step explanation:

6^-6 - (-5) = 6^(-6 + 5) = 6^(-1)

A lot of things are going on in this question. Notice how the 5 is handled. It starts off in the denominator as - 5 and when brought to the numerator it becomes -(-5) which makes it + 5.

The answer is then easy. It is 6^(-6 + 5) = 6^-1

You could give the answer as 1/6 but that is not what the question says.

8 0
3 years ago
A movie complex is showing the same movie and three theaters in theater and a 60 of the 80 seats are taken and theater B 42 seat
Anna [14]

Answer:

Theatre C.

Step-by-step explanation:

Theatre A:

60 of the 80 seats are taken.

% seats taken = seats taken/total seats * 100

= 60/80 * 100

= 75%

Theatre B:

Total seats = number of seats taken + number of empty seats

= 42 + 18

= 60

% seats taken = seats taken/total seats * 100

= 42/60 * 100

= 70%

Theatre C:

Total seats = number of seats taken + number of empty seats

90 = X + 18

X = 72

% seats taken = seats taken/total seats * 100

= 72/90 * 100

= 80%

Theatre C with 80% of seats taken.

4 0
3 years ago
Read 2 more answers
Other questions:
  • A house has increased in value by 38% since it was purchased. If the current value is $621,000 what was the value when it was pu
    13·1 answer
  • There are 15 fewer runners on varsity track than junior varsity track. If there are 41 runners on junior varsity track, how many
    9·1 answer
  • Mary leaves her house to take a walk. In the graph shows the distance d in feet from her house that Mary is at any given time t
    13·1 answer
  • Find x if 8.4% of x is 420.The right answer will be marked as brainliest and the wrong answer will be reported
    7·1 answer
  • Simplify √72 - √27 + 2√8 <br>-30√6<br>7√5<br>-2√3+5√2<br>10√2-3√3​
    13·1 answer
  • Rate this app 1/10 and explain why
    11·2 answers
  • In fort worth, texas, 6 bats ate 36 grams of insects in one night. At this rate, how many grams of insects could 42 bats eat in
    9·2 answers
  • HELP ASAP WILL GIVE BRAINLEST TO CORRECT ANSWER
    8·1 answer
  • What percent is shaded in the grid? Answer:​
    7·1 answer
  • 3k+7k-2=6k+16 answer?
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!