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
Anettt [7]
3 years ago
7

If using the method of completing the square to solve the quadratic equation x^2-9x+2=0x 2 −9x+2=0, which number would have to b

e added to "complete the square"?
Mathematics
1 answer:
ale4655 [162]3 years ago
7 0

Answer:

The number to be added is 81/4

Step-by-step explanation:

To get the number, we look at the coefficient of x

In this case, we have it as -9

we divide this by 2

It gives (-9/2)

We square this value and add it to both sides

This would be

(-9/2)^2 = 81/4

It is this number we will add to both sides of the equation

You might be interested in
Find the area please :))))))
ExtremeBDS [4]

Answer:

86.60 units²

Step-by-step explanation:

It’s composed of two equilateral triangles (60-60-60).

(10√3)/2=8.66 (the height of each triangle

area = 1/2bh

1/2(10)(8.66)=43.30127

43.30127x2=86.60254

6 0
3 years ago
Solve <img src="https://tex.z-dn.net/?f=-2x%5E2%20%2B3x%20-%209%20%3D%200" id="TexFormula1" title="-2x^2 +3x - 9 = 0" alt="-2x^2
MArishka [77]

Answer:

x= \frac{3-3\sqrt{7}i }{4} and x= \frac{3+3\sqrt{7}i }{4}

Step-by-step explanation:

We have to solve the given equation - 2x² + 3x - 9 = 0

To solve the equation given above we have to factorize the left-hand side of the equation.

But it can not be factorized. So, use the Sridhar Achaya formula.

Therefore, x= \frac{-3 + \sqrt{3^{2}-4 \times (-2) \times (-9) } }{2\times (-2)} and x= \frac{-3 -\sqrt{3^{2}-4 \times (-2) \times (-9) } }{2\times (-2)}

So,  x= \frac{3-3\sqrt{7}i }{4} and x= \frac{3+3\sqrt{7}i }{4} {Where i=\sqrt{-1}}

Therefore, the solutions are imaginary numbers. (Answer)

Note: The Sridhar Acharya Formula gives if ax² + bx + c = 0, then the roots of the equation are x = \frac{-b + \sqrt{b^{2}-4ac } }{2a} and x = \frac{-b - \sqrt{b^{2}-4ac } }{2a}.  

3 0
4 years ago
Find the difference quotient f(x)−(3)−3 when ()=1+4−5^2. Simplify the expression fully as if you were going to compute the limit
Naddik [55]

The difference quotient of the expression will be 4.

<h3>How to find the quotient?</h3>

f(x) = 5 + 5x + 4x²

f(3) = 5 + 5(3) + 4(3)³

= 56

Now [f(x) - f(3)]/(x - 3) will be:

= (4x² + 5x + 5 - 56)/(x - 3)

= (4x² + 5x - 51)/(x - 3)

= (4x² + 17x - 12x - 5)/(x - 3)

= (4x + 17)(x - 3)/(x - 3)

= 4x + 17

The difference quotient will be:

g(x + h) = 4(x + h) + 17

= [g(x + h) - g(x)]/h

= (4x + 4h + 17 - 4x - 17)/h

= 4h/h

= 4

Learn more about quotient on:

brainly.com/question/673545

#SPJ1

6 0
2 years ago
Increase 400 by 1%<br> yes I need help please
Dima020 [189]

Answer:

404

Step-by-step explanation:

1% of 400 is 4

5 0
3 years ago
5.82×10^2 can some one help me
alex41 [277]

5.82×10^2= 582

10^2= 10×10  10×10=100

5 0
3 years ago
Other questions:
  • Find the value of x and the value of y.
    8·1 answer
  • Factor completely, then place the factors in the proper location on the grid.
    8·1 answer
  • The diagonals of a rhombus are 6cm and 10cm long. what is the area of the rhombus?
    14·1 answer
  • ∠x and ∠y are supplementary angles. ∠y measures 97੦ What is the measure of ∠x?
    9·1 answer
  • Kylie started basketball practice at 2:30 p.m and finished at 6:00 p.m how long was kylie at basketball practice
    15·2 answers
  • Which function is odd?
    9·1 answer
  • The number of a checking account is also known as a.account number b.checking number c. Bank number d.routing number
    10·1 answer
  • Can someone help me with this question please? ASAP
    7·1 answer
  • To be able to go on a trip to South America, Salma decides to save for 2 years. She opens a savings account with $700 . The acco
    12·1 answer
  • What is the answer<br> 3x-4=2x+1
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!