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
Ann [662]
3 years ago
10

Find the zeros of y=x2-4x-9 by completing the square

Mathematics
1 answer:
Naya [18.7K]3 years ago
8 0

Answer:

x = 2 ± \sqrt{13}

Step-by-step explanation:

To find the zeros let y = 0, that is

x² - 4x - 9 = 0 ( add 9 to both sides )

x² - 4x = 9

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- 2) x + 4 = 9 + 4

(x - 2)² = 13 ← take the square root of both sides

x - 2 = ± \sqrt{13} ← add 2 to both sides

x = 2 ± \sqrt{13}

You might be interested in
PLS HELP WILL GIVE BRAINLEST AND THANKS!!!!!!!!!!!
Stels [109]

Answer:  2 1/4 more flour for 9 servings

Step-by-step explanation: (a) how many total cups of flour are there per serving? show your work

1 1/2÷6= 3/2 x 1/6 = 3/12= 1/4 cups of flour per serving

(b) how many total cups of sugar (white and brown) are there per serving?show your work

3/4 + 1/3 = 9/12 + 4/12= 13/12= 1 1/12 total cups of sugar

13/12 ÷ 6/1 = 13/12 x1/6 = 13/72 per serving

(c) supposed you modify the recipe so that it makes 9 servings. How much more flour do you need for the modified recipe than you need for the original recipe?Show your work/

1/4 x 9 = 9/4 = 2 1/4 more flour for 9 servings.

8 0
2 years ago
Read 2 more answers
Help please i need it fast
san4es73 [151]

Answer:

125x125

125=5x5x5

125x125=5x5x5x5x5x5=5 to the power of 6

6 0
2 years ago
Read 2 more answers
What kind of angle is 2X?
andrezito [222]

Answer:

b

Step-by-step explanation:

3 0
3 years ago
.Choose the equation that represents the line that passes through the point (−1, 6) and has a slope of −3.
leonid [27]
Y=-3+3 answer do I need to explain?
5 0
2 years ago
A bag contains the following marbles: 5
Inessa [10]

Answer:

5:20

Step-by-step explanation:

There are 5 black marbles and 20 brown marbles.

You would put black marbles (5) first, because it came before brown (20) in the list.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Divisible by 3?
    8·1 answer
  • Give a real-life situation for the sum -15 + 10
    11·1 answer
  • How do I rewrite the expression as a multiple of a sum of 2 numbers with no common factor? 30 + 12
    5·2 answers
  • How do I rewrite the quadratic function in intercept
    15·1 answer
  • Answer correctly for brainliest and also a thanks ! Don't answer if you don't know it please . Also the last answer choice D is
    9·1 answer
  • Please help me. Is that right?
    15·2 answers
  • The table and the graph each show a different relationship between the same two variables, x and y:
    10·1 answer
  • 232 - 47 equals to?? a simple subtraction question, just a dot in your vast amount of answered questions but please help me out!
    10·2 answers
  • Help please!!!!!!!!!!!!!
    11·1 answer
  • Peter and Henry went to the movies Peter bought the two Movie tickets for 7 dollars each. How much did he spend for the movie ti
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!