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
wariber [46]
3 years ago
10

Solve 3x2 + 18x + 15 = 0 by completing the square.

Mathematics
1 answer:
kondaur [170]3 years ago
3 0
<span>3x^2 + 18x + 15 = 0
15 + 18x + 3x2 = 0
3(5 + 6x + x2) = 0
</span>3((5 + x)(1 + x)) = 0
5 + x = 0
5 + -5 + x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + x = 0 + -5 x = 0 + -5
x = -5
<span>--------------------------------------------
1 + x = 0 x=-1
-5,-1 </span>
You might be interested in
What is the other endpoint if one endpoint is (10,12) and the midpoint is (6,9).?
Lubov Fominskaja [6]

Answer:

(2,\, 6).

Step-by-step explanation:

Let (x_{0},\, y_{0}) and (x_{1},\, y_{1}) denote the two endpoints.

The formula for the midpoint of these two points would be:

\displaystyle \left(\frac{x_{0} + x_{1}}{2},\, \frac{y_{0} + y_{1}}{2}\right).

(Similar to taking the average of each coordinate.)

In this question, it is given that x_{0} = 10 whereas y_{0} = 12. Substitute these two values into the expression for the coordinate of the midpoint:

  • x-coordinate of the midpoint: \displaystyle \frac{10 + x_{1}}{2} = 6.
  • y-coordinate of the midpoint: \displaystyle \frac{12 + y_{1}}{2} = 9.

Solve these two equations for x_{1} and y_{1}: x_{1} = 2 whereas y_{1} = 6.

Hence, the coordinate of the other point would be (2,\, 6).

4 0
2 years ago
Given the polynomial 2x^3+18x^2-18x-162, what is the value of the constant "k" in the factored form?
maxonik [38]
2x³+18x²<span>-18x-162 = 
2(</span>x³+9x²-9x-81)=
2(x²(x+9)-9(x+9))=
2(x²-9)(x+9)=
2(x+3)(x-3)(x+9)

Answer: k=3
7 0
3 years ago
Find the distance between -6 and 8. What is an expression that represents the distance?
snow_lady [41]

The answer is -6+x=8. x is the unknown number. To find the distance, try to use a number line. And the answer to the expression is 14. To get from -6 to 0, you add 6. Then from 0 to 8, you add 8. 8+6=14

6 0
3 years ago
If 90 tickets were sold at Gate C, what was the total number of tickets sold?
Paladinen [302]
756 is your answer Hope this helps
7 0
3 years ago
Analyzing Student Work
Romashka-Z-Leto [24]

Answer: B

Step-by-step explanation:

Edge2020

4 0
3 years ago
Other questions:
  • Find the length of the leg. If your answer is not an integer, leave it in simplest radical form. answer asap pls
    10·2 answers
  • Find the arc length (to the nearest inch) of the sector of a circle with a radius 14 inches and a central angle of 0=108°
    10·1 answer
  • 100 points I have answer. Can someone explain this correct answer, I know its correct, but need to understand why? Do we subtrac
    10·2 answers
  • Which equation should be used to find the volume of the figure?
    8·1 answer
  • 3) A box of chocolates contains five milk chocolates, five dark chocolates, and five white
    5·1 answer
  • Write an equation and solve. Round to the nearest hundredth where necessary.
    14·1 answer
  • Write and solve two different division expressions that have a negative quotient. Use the fractions − 2/3 , 5/6 , and − 1/4.
    13·1 answer
  • -4.67 + (5.24 – <br> ) – (<br> + 7.98) = 13.26
    5·1 answer
  • Pls help me <br><img src="https://tex.z-dn.net/?f=49%20%3D%20%20%7Bx%7D%5E%7B2%7D%20" id="TexFormula1" title="49 = {x}^{2} " al
    8·2 answers
  • I need help with this please
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!