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
lys-0071 [83]
3 years ago
5

What two numbers multiply to -15 and can also add up to -7

Mathematics
1 answer:
prohojiy [21]3 years ago
8 0
Let the numbers be x and y
According to the data : xy=-15 and x+y=-7
xy=-15
x+y=-7

y=-7-x
x(-x-7)=-15

y=-7-x
-x^2-7x=-15

y=-7-x
x^2+7x-15=0

y=-7-x
x=(-7±sqrt(7*7+4*15))/2

y=-7-x
x=(-7±sqrt(109<span>))/2
</span>
Goes to two systems.
 1) 
y=-7-x
x=(-7+sqrt(109<span>))/2
</span>

y=-7+3.5-sqrt(109<span>))/2
</span>x=(-7+sqrt(109<span>))/2
</span>
y=-3.5-sqrt(109<span>))/2
</span>x=(-7+sqrt(109<span>))/2
</span>
2)
y=-7-x
x=(-7-sqrt(109<span>))/2
</span>
y=-7+3.5+sqrt(109))/2
x=(-7-sqrt(109))/2

y=-3.5+sqrt(109))/2
x=(-7-sqrt(109<span>))/2</span>
You might be interested in
please help me it is URGENT pls the first one is solve and the 2nd one is simplify I will give u lots of points thank you
klasskru [66]
I.) (5x+3)/4-(2x-4)/3=5
Clear fractions:
3·((5x+3)/4)=15x+9
4·((2x-4)/3)=8x-16
15x+9-(8x-16)=5
15x+9-8x+16=5
Combine like terms:
7x+25=5
7x=-20
x=-20/7

II.) (3/11)·(5/6)-(9/12)·(4/3)+(5/13)·(6/15)
Remember PEMDAS
So first multiply:
3/11·5/6=15/66
9/12·4/3=3/3·1/1=3/3=1
5/13·6/15=1/13·6/3=6/39=2/13
(15/66)-1+(2/13)
Combine:
15/66-1/1=15/66-66/66=-51/66
-51/66+2/3=-51/66+44/66=-7/66
Answer: -7/66 :)
7 0
3 years ago
Read 2 more answers
The area of a football field can be calculated
pashok25 [27]
360 ft * 160ft = 57,600 ft squared 

I'm not sure, this question was kind of confusing
5 0
3 years ago
Solve -103 = 6x + 17.<br><br> (A) -16<br> (B) 16<br> (C) -20<br> (D) 20
andrew11 [14]
The correct answer is C (-20) let me know if you want to know how I got that answer
3 0
3 years ago
Read 2 more answers
15 patients were discharged yesterday. 5 were hospitalized 4 days 6 were hospitalized 5 days and the rest were in for 2, 4, 8, 1
S_A_V [24]
2+4+8+10=24

24 divided by 4 is 6

6
7 0
3 years ago
(05.02 LC)<br> Which equation does the graph below represent?
NISA [10]

Answer:

I think y= -1/3x

sorry if wrong

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • Which choice shows the best estimate of the product 0.52×695 ?
    15·1 answer
  • The batteries produced in a manufacturing plant have a mean time to failure of 30 months, with a standard deviation of 2 months.
    14·1 answer
  • A rectangular school banner has a length of 40 inches and a width of 24 inches. A sign is made that is similar to the school ban
    10·1 answer
  • Plsss help mee xoxox
    7·1 answer
  • Choose the correct answer.
    11·1 answer
  • What is the x-intercept of the line with equation 3y - 8x = 10? Represent your answer as a point in (x, y) form.
    12·1 answer
  • 10x8x38x12/10 PLSEASEE HELP WILL MARK BRAINLIEST
    6·2 answers
  • Amanda caught a 3 pound fish. How much did it weigh in ounces? Use the table below. Include the correct unit in your answer.
    6·2 answers
  • Which math expression means "the quotient of an unknown number and 27"?
    10·1 answer
  • ILL GIVE BRAINLIEST TO THE CORRECT ANSER BUT ANSWER ASAP
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!