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
nirvana33 [79]
3 years ago
8

How many real roots does the function f(x)=x^2+8x-2

Mathematics
2 answers:
enyata [817]3 years ago
6 0
Using the discriminant
for
f(x)=ax²+bx+c

the discriminant is b²-4ac
when it is
1. less than 0, there are no real roots
2. equal to 0, then there is 1 real root
3. more than 0, 2 real roots



given
f(x)=1x²+8x-2
a=1
b=8
c=-2
discriminat
8²-4(1)(-2)
64+8
this is greater than 0
2 real roots
galina1969 [7]3 years ago
3 0
First find the determinant, Δ = b^2 - 4ac 
<span>a = 1, b = 8 , c = -2 </span>
<span>Δ = 8^2 - 4*1*-2 </span>
<span>Δ = 64 + 8 </span>
<span>Δ = 72 > 0 </span>
<span>therefore there are two real roots!</span>
You might be interested in
Paula buys a machine for $6600, which includes a sales tax of 20 per cent. Without sales tax, the price is? plse i need help
nika2105 [10]

Answer:

5,280

Step-by-step explanation:

6600 x 20 = 132,000

132,000 / 100 = 1320

6600 - 1320 = 5280

give brainliest pls

5 0
3 years ago
Kiera wants to increase her savings account to a balance of $1,350. Her current balance is $174 and she adds $84 a month to her
Yuri [45]
Her goal : 1350

What she has now: 174

she earns 84$ a month

answer is 14 months because 84* 14 is 1176 and if u add 174 $ to that it will give u 1350.
5 0
3 years ago
Read 2 more answers
What is a quotient ??? I do not understand
kirza4 [7]
A quotient is a answer or the sum
6 0
3 years ago
Read 2 more answers
Order these numbers from least to greatest. 4811 , 4.626 , 5.63 , 9320
scoundrel [369]
4.626,5.63,4811,9320.........
8 0
3 years ago
For the function f(x) = 2x +3, evaluate f(3).
AveGali [126]

Answer:

9

Step-by-step explanation:

f(3) = 2(3) + 3

= 9

4 0
3 years ago
Read 2 more answers
Other questions:
  • Evaluate r(x) = −0.21x^3 + x^2 − 8.1x − 3 for x = −1 and x = 2.
    5·1 answer
  • INVESTMENTS Determine the amount of an investment if $1000 is invested at an interest rate of 8% compounded quarterly for 2 year
    7·1 answer
  • Rex walks 3 1/7 km in 1 1/4 hours. At the same speed , how long will he go in one hour? Simplify your answer and write it as a p
    11·1 answer
  • The formula for the volume of a pyramid is V = 1/3 Bh, where B is the area of the base of the pyramid snd h is the height of the
    12·2 answers
  • The graph of f(x) = 2x3 +x2 – 4x – 2 is shown. How many of the roots of f(x) are rational?
    14·2 answers
  • Represent the following fractions as a decimal and percent: 7/20 and 5/9​
    14·1 answer
  • What is the simplest form of this expression? (x + 7)(3x − 8) A. 3x2 + 2x − 15 B. 3x2 + 29x − 1 C. 3x2 − 29x − 56 D. 3x2 + 13x –
    12·2 answers
  • How do i do this problem?
    12·1 answer
  • Given: p || q, and r || s.
    14·1 answer
  • A survey was done to see if residents drive a car or ride the bus. Let C represent residents who drive a car and
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!