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
Allisa [31]
3 years ago
13

Use the quadratic formula to solve this equation to 3sf: 5x^2-2x-11=0

Mathematics
2 answers:
Rama09 [41]3 years ago
7 0
X=1/5+2/5√14 or 1/5 + -2/5√14
Evgen [1.6K]3 years ago
5 0
The quadratic formula is the result of completing the square for ax^2+bx+c=0 and it is:

x=(-b±√(b^2-4ac))/(2a)  in this case:

x=(2±√(4-4(5)(-11))/(2(5))

x=(2±√224)/10

x=(2±4√14)/10

x=(1±2√14)/5

x≈(-1.30, 1.70)  (to three significant figures)
You might be interested in
A building has a window that is 12 feet high. Stan is going to use a ladder to get up to the window and decides to keep the ladd
olasank [31]
Answer=13 feet long

This information describes a right triangle, with sides 5ft and 12ft.

a²+b²=c²
5²+12²=c²
25+144=c²
169=c²
√169=√c²
13=c

The ladder needs to be 13ft long
3 0
3 years ago
Which formula can be used to describe the sequence?
alexdok [17]

Answer:

f(x+1) = -3/4 × f(x)

Step-by-step explanation:

first of all, the sign of the numbers in the sequence is alternating. so, there must be a "-" involved.

that eliminates the first and third answer options.

and the absolute values of the numbers in the sequence are going down. |f(x+1)| < |f(x)|

that eliminates the fourth answer option, as this says that

|f(x)| < |f(x+1)|. and that is the opposite of how the actual sequence behaves.

7 0
3 years ago
Cece works at a dress shop and needs to calculate the discounts for dresses on sale using the formula d=(p−c)÷2, where d is the
lakkis [162]

Answer:

$35

Step-by-step explanation:

Using the formula provided, d=(p−c)÷2 (where d is the discount, p is the original price, and c is the store's cost for the dress.) we can determine the discount.

The original price is 120,

d=(120−c)÷2

The store's cost is 50,

d=(120−50)÷2

So we subtract 120 and 50 to get

d=(70)÷2

70 divide by two is

d= 35

The discount is $35

4 0
3 years ago
Find the equation of the line I in the following picture. The shapes under the lines are squares
julia-pushkina [17]
If you look carefully at the graph, you may see that the slope of the line is
          3-4           -1
---------------- = ------ = m
         7-4             3

thus, you have the slope of the line and two points on the line.  Suppose we
choose the point (4,4) and subst. the known slope and the coordinates of this point into the point-slope formula for the eqn of a str line:

y-y1 = m (x-x1)

y-4 = (-1/3)(x-4)

This is the desired equation.  You could, if you wished, change this into slope-intercept form.
5 0
2 years ago
Find the value of x if mPYA 12x 20 and m LPLA 110O 220O 240O 20O 40
romanna [79]
M<PLA = 1/2 m PYA
110 = 1/2 (12x - 20)
12x - 20 = 220
12x = 220 + 20 = 240
x = 240 / 12 = 20
4 0
3 years ago
Other questions:
  • What is the value of x?​
    8·1 answer
  • 0.0125 convert to fraction
    12·2 answers
  • - x2 +17x-23=0<br><br> Identify the values of a, b , c in the quadratic equation
    5·2 answers
  • Combined 5 Z + 3 - 3 Z ​
    12·2 answers
  • HELPPP PLEASEEEE :) !!!!!
    10·1 answer
  • Help me please!!!!!!!!
    5·1 answer
  • Simplify the expression: 7(9x + 6y)
    5·1 answer
  • Plz, help! Due soon!
    6·2 answers
  • The ages of Beau's cousins are represented by the box plot
    9·2 answers
  • Find x if the ekvation is <br> x-3x+7x/2-1=9
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!