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
Tpy6a [65]
3 years ago
10

X squared minus x equals 72

Mathematics
2 answers:
gogolik [260]3 years ago
7 0
x^2-x=72\\
x^2-x-72=0\\
x^2-9x+8x-72=0\\
x(x-9)+8(x-9)=0\\
(x+8)(x-9)=0\\
x=-8 \vee x=9
professor190 [17]3 years ago
5 0
x^2-x=72\\\\x^2-x-72=0\\\\a=1;\ b=-1;\ c=-72\\\\\Delta=b^2-4ac\to\Delta=(-1)^2-4(1)(-72)=1+288=289\\\\x=\frac{-b\pm\sqrt\Delta}{2a}\\\\\sqrt\Delta=\sqrt{289}=17\\\\x=\frac{-(-1)\pm17}{2(1)}=\frac{1\pm17}{2}\Rightarrow x=\frac{-16}{2}=-8\ or\ x=\frac{18}{2}=9
You might be interested in
I need help on this, if anyone knows how to do this can you help me out pls
ASHA 777 [7]
<h3>Answer:  (3, 0)</h3>

=================================================

Explanation:

Let's isolate x in the first equation.

x-2y = 3

x = 3+2y

Then we'll plug this into the second equation

Afterwards, solve for y.

2x + 4y = 6

2(3+2y)+4y = 6

6+4y+4y = 6

8y+6 = 6

8y = 6-6

8y = 0

y = 0/8

y = 0

Use this to find x.

x = 3+2y

x = 3+2(0)

x = 3

The solution is therefore (x,y) = (3, 0)

If you were to graph both lines, then they would intersect at the location (3,0).

-----------------------------

Checking the answer:

Plug x = 3 and y = 0 into the first equation.

x-2y = 3

3-2(0) = 3

3 - 0 = 3

3 = 3 that works

Repeat for the other equation

2x+4y = 6

2(3) + 4(0) = 6

6 + 0 = 6

6 = 6 that works as well

Both equations are true when (x,y) = (3,0).

The solution is confirmed.

6 0
3 years ago
Plis necesito ayuda en esta tarea:
Ede4ka [16]

Answer:

92749021918383738642467

4 0
3 years ago
ANSWER FOR 10 POINTS!<br> THANKS
Roman55 [17]
The diagonal line is the hypotenuse of a triangle whose sides are both 50 yds, so you can use Pythagoras (a^2 + b^2 = c^2) to find the answer. 50 × 50 = 2500, and 2500 + 2500 = 5000. Because 5000 is c^2, the answer is D) √5000. I hope this helps!
8 0
4 years ago
11/2=21/2/5/2(9/2)+b<br> Solve for b
____ [38]
We can times 5/2 and 9/2. And then divide that number with 21/2.
Then we can get 15/14.
We can subtract 15/14 from 11/2.
b=31/7
4 0
4 years ago
Can some one help? I don't really understand this​
Alex Ar [27]

Answer:

4 pull ups and 32 push ups

Step-by-step explanation:


5 0
3 years ago
Other questions:
  • 3 multiplied by the sum of a number and 5
    13·1 answer
  • Hanks pickup can travel 85 miles on 5 gallons of gas. How many gallons will his pickup need to travel 34 miles?
    13·1 answer
  • What is 50 minutes before 8
    11·1 answer
  • 3. Brenda's school is selling tickets to a spring musical. On the first day of
    15·1 answer
  • The monthly mortgage payment on your house is $821.69. it is a 30 year mortgage at 6.5% compounded monthly. how much did you bor
    6·1 answer
  • most adult medication doses are for a person weighing 150 pounds. for a 45 pound child, the adult dose should be multiplied by 0
    6·1 answer
  • A rectangular plot of farmland will be bounded on one side by a river and on the other three sides by a​ single-strand electric
    11·1 answer
  • Which coordinate pair is in the solution set for y&lt; 1 - 6x?
    14·2 answers
  • PLS HELP PLS HELP PLS HELP
    6·1 answer
  • I’m not sure how to do it
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!