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
BARSIC [14]
2 years ago
7

Solve x2−4x−12=0 by completing the square. A x=−2 B x=−6 or x=2 C x=−2 or x=6 D x=−6

Mathematics
1 answer:
MrRissso [65]2 years ago
8 0

Answer:

B x=-6

x=2

Step-by-step explanation:

You might be interested in
Given the inequality of x < 5, select all the
diamong [38]
Nxnxnxbbxnxndnnsnsn nsnsnsndnnsndnndndnsndnndndnndnd
7 0
2 years ago
Please help me with my math homework what is the answer!!!
Dmitry [639]

Answer:

Step-by-step explanation:

The letters are easy enough.

y^3 determines that 3 ys are needed. y^2 is taken in by the cubed.

x^4 determines that 4 xs are needed. x^3 is part of x^4 and you don't need any more xs

12 and 42 are the parts that will cause the problem. Factor them both into prime factors

12: 2 * 2 * 3

42: 2 * 3 * 7

You need two 2s.

You need one 3

You need one 7

LCD = 2 *2*3 * 7 = 84

6 0
2 years ago
8x + 12 = 4r - 16 find r
Luda [366]

Answer:

r = 2x + 7

Step-by-step explanation:

get r on one side

8x + 12 + 16 = 4r

divide both sides by 4 to get r by itself

8x/4 + 12/4 + 16/4 = 4r/4

2x + 3 + 4 = r

2x + 7 = r

or

r = 2x + 7

8 0
2 years ago
Length of a rectangle is 5 cm longer than the width. Four squares are constructed outside the rectangle such that each of the sq
TiliK225 [7]

Answer:

The perimeter of rectangle is 18\ cm

Step-by-step explanation:

Let

x-----> the length of the rectangle

y----> the width of the rectangle

we know that

x=y+5 ----> equation A

120=xy+2x^{2}+2y^{2}  ---> equation B (area of the constructed figure)

substitute the equation A in equation B

120=(y+5)y+2(y+5)^{2}+2y^{2}

120=(y+5)y+2(y+5)^{2}+2y^{2}\\ 120=y^{2}+5y+2(y^{2}+10y+25)+2y^{2}\\ 120=y^{2}+5y+2y^{2}+20y+50+2y^{2}\\120=5y^{2}+25y+50\\5y^{2}+25y-70=0

using a graphing calculator -----> solve the quadratic equation

The solution is

y=2\ cm

Find the value of x

x=y+5 ----> x=2+5=7\ cm

Find the perimeter of rectangle

P=2(x+y)=2(7+2)=18\ cm

4 0
3 years ago
Read 2 more answers
Find the product.<br> (x+2)(x−2)=
kaheart [24]

Answer:

x² - 4

Step-by-step explanation:

Step 1: Write expression

(x + 2)(x - 2)

Step 2: FOIL

x² + 2x - 2x - 4

Step 3: Combine like terms

x² - 4

8 0
3 years ago
Read 2 more answers
Other questions:
  • Can someone anyone please man help me out
    14·1 answer
  • Mike ran 7 miles on his first day of training. The next day he ran 8/10 that distance. How far did he run the second day.
    8·1 answer
  • if a Balloon is filled with 282 cubic inches of a gas at a pressure of 14 pounds per square jnch, using inversely proportional f
    13·1 answer
  • What are the multiples of 12,7,5,18,14,8?? Please explain !!!
    13·2 answers
  • W varies inversely as the square root of x when x=4 w=4 find when x=25
    11·1 answer
  • sean sold 4 more boxes of candy for the school fundraiser than Chris. The sum of the boxes that they sold was 22
    7·2 answers
  • An angle measures 48.4° less than the measure of its complementary angle. What is the measure of each angle?
    5·1 answer
  • The sum of two rational numbers is −3/5 . If one of them is −9/20, find the other.
    7·2 answers
  • A jar contains only​ pennies, nickels,​ dimes, and quarters. There are 29 ​pennies, 13 ​dimes, and 21 quarters. The rest of the
    11·2 answers
  • Christopher and Edward were painting wagon wheels for the school play. The pictures show how much of the wheels they painted. Ho
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!