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
ella [17]
3 years ago
11

7b squared -21b-273=7

Mathematics
2 answers:
guajiro [1.7K]3 years ago
8 0

Answer:

Given 7b²-21b-273=7, the solutions are x1 = 8 and x2 = -5.

Step-by-step explanation:

Given 7b²-21b-273=7, first you need to equal zero. So

7b²-21b-273-7=0 ⇒ 7b²-21b-280 = 0

The secon step is to find the solutions applying Bhaskara´s formula x = (-b ± √(b²-4×a×c))/2×a

Where a=7, b= -21 and c= -280

After you identified each term, you have to replace it on the formula so....

x = (21 ± √(21² - 4×7×(-280)))/2×7 ⇒ x = (21 ± √(441 + 7840))/14                   ⇒ x = (21 ± √8281)/14

Then you will obtain two values for x, called x1 = 8 and x2=-5.

makvit [3.9K]3 years ago
8 0

7b^2 -21b -273 =7

Moving the -273 to the right hand side

7b^2 -21b =7+273

7b^2 -21b =280

Dividing the whole equation by 7,thus 7b^2/7 -21b/7 = 280/7

You will get

b^2 -3b =40.

Solving the equation as quadratic by moving the 40 to left side and equating the equation to zero, thus

b^2 -3b -40 =0

Factorizing b , you will get

(b-8) and (b+5) =0 thus b=8 ,b=-5 respectively. Now substituting the -5 in the equation satisfies it. Therefore b = -5

You might be interested in
What is the solution to the equation Negative 4 (2 x + 3) = 2 x + 6 minus (8 x + 2)?
shtirl [24]

Answer:

x = –8

Step-by-step explanation:

6 0
2 years ago
Read 2 more answers
Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positi
larisa [96]

Answer:

lol don't listen to him/her, they're wrong.

it's 0.92, for plato. i got it right

Step-by-step explanation:

4 0
2 years ago
Help I don’t get it at all
Naily [24]
The answer to your question is n is equal to 70
5 0
3 years ago
Read 2 more answers
What are the coordinates of S?
ehidna [41]

Answer:

(-2,6) is the codinates of S

3 0
3 years ago
Diego bought a bicycle that cost $180. In addition he had to pay 8% sales tax on it.
yaroslaw [1]

Answer:

$14.40

Step-by-step explanation:

$180 * 8% ( Or 0.08 )

7 0
2 years ago
Other questions:
  • What is 4/15 as a decimal and percent?
    13·1 answer
  • One-fourth of the girls and one-eighth of the boys in a class retake their school pictures. The photographer retakes pictures fo
    12·1 answer
  • Using linked lists or a resizing array; develop a weighted quick-union implementation that removes the restriction on needing th
    9·1 answer
  • Which equation represents this number sentence?<br> Two less than one-fourth of a number is 10.
    10·1 answer
  • What is the slope of the line passing through the points (6,7) and (1,5)
    12·1 answer
  • Write 240 as a product of primes. Use index notation where appropriate.
    10·1 answer
  • If the height of a triangle is five inches less than the length of its base, and if the area of the triangle is 52 square inches
    13·1 answer
  • How much would $500 invested at 5% interest compounded continuously be worth after 8 years?
    15·1 answer
  • -5/12+5/8 what is the answer to this
    8·1 answer
  • A 50-gal tank initially contains 10 gal of fresh water. At t = 0, a brine solution
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!