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
Zarrin [17]
2 years ago
8

Solve the quadratic equations

Mathematics
1 answer:
Alexxx [7]2 years ago
6 0

Answer:

for quadratic equation 1

y^2-10y+21=0

Step-by-step explanation:

y^2-7y-3y+21=0

y(y-7)-3(y-7)=0

(y-7)(y-3)=0

y-7=0,y-3=0

y=7,y=3

y=(3,7)

for quadratic equation 2

16p^2-8p+1=0

16p^2-4p-4p+1=0

4p(4p-1)-1(4p-1)=0

(4p-1)twice=0

4p-1=0,4p-1=0

4p=1

p=1/4 twice

for quadratic equation 3

x^2-400=0

x^2=400

x=√400

x=20

for quadratic equation 4

-16m^2-8m-1=0

multiply the equation by -

16m^2+8m+1=0

16m^2+4m+4m+1=0

4m(4m+1)1(4m+1)=0

4m+1=0 twice

m=-1/4 twice

for quadratic equation 5

-3n^2+75=0

divide both side by -3

-3n^2/-3=-75/-3

n^2=25

n=√25

n=5

You might be interested in
Factorise (x-y)^2-(x-y)^3=?
bogdanovich [222]

Answer:

\left(x-y\right)^2\left(1-x+y\right)

Step-by-step explanation:

You factor out the common term first.

You should get the equation below.

\left(x-y\right)^2\left(1-\left(x-y\right)\right)

then you get rid of the negative inside\left(1-\left(x-y\right)\right)

and will be simplified to this.

\left(x-y\right)^2\left(1-x+y\right)

4 0
3 years ago
What is the value of x?<br> Please show how you got that answer so I can learn, thanks.
andre [41]
Tsquare= Ksquare +Vsquare -2(K)(V) times cosT
7 0
3 years ago
Please help this makes no sense to me
Whitepunk [10]
The answer to your question: the ratio of 4 months that have 30 days is ✨3 to 1✨
8 0
3 years ago
Read 2 more answers
Given the system of equations presented here:
Nata [24]
2x + 4y = 14
4x + y = 20......multiply by -4
----------------
2x + 4y = 14
-16x - 4y = -80 (result of multiplying by -4)
---------------add
-14x = -66....as u can see, ur y's cancel out

so ur answer is : 1st answer choice <==

** and just so u know, u could have multiplied the 1st equation by -2, and it would have cancelled out ur x's
6 0
3 years ago
Which figures are polygons
Tatiana [17]
The answer is A. A, D the reason being, is because polygons have sides C, and B have no sides so we can eliminate those immediately.
5 0
3 years ago
Other questions:
  • What's is the numerator and denominator of a fraction in simplest form that is equivalent to
    15·2 answers
  • At noon on January 7, the temperature in Buffalo, New York, was 1 degree below 0F?. The temperature in Pittsburgh, Pennsylvania,
    10·2 answers
  • (0, -5), (1, 0), (2, 5), (3, 10)<br> in ordered pairs
    13·1 answer
  • Complete the explanation of the error.
    5·1 answer
  • Find the length of arcAB. *
    7·1 answer
  • Every 24 hours, Earth makes a full rotation around its axis. Earth's speed of rotation at the equator is 1,670 km per hour. What
    6·1 answer
  • 1. Match the letter of the centre to the lines that define it.
    9·1 answer
  • I'll give the brainiest
    14·2 answers
  • Determine which equation below can be solved to find the value of ∠A.
    6·1 answer
  • Find all complex solutions of the equation 2^2 − 6 + 49 = 0. Express complex numbers in the form + .
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!