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
Lelu [443]
3 years ago
5

Use the quadratic formula to find the exact solutions of x2 - 5x - 2 = 0.

Mathematics
1 answer:
Fudgin [204]3 years ago
6 0

Step-by-step explanation:

{x}^{2}  - 5x - 2 = 0 \\ a = 1 \: and \: b =  - 5 \: and \: c =  - 2 \\ x =  \frac{ - b± \sqrt{ {b}^{2} - 4ac } }{2a}  \\ x =  \frac{ - ( - 5)± \sqrt{ {( - 5)}^{2}  - (4 \times 1 \times  - 2)} }{(2 \times 1)}  \\ x =  \frac{5± \sqrt{33} }{2}  \\ either : x =  \frac{5 +  \sqrt{33} }{2} \:  or \:  \frac{5 -  \sqrt{33} }{2}  \\ x = 5.4 \: or \:  - 0.4

You might be interested in
Please help i need this done by today !!
riadik2000 [5.3K]

Answer:

4) b

5) b

6) ?

7) Question content is incorrect

8) b

Sorry I couldn’t help more.

5 0
2 years ago
Ill give branliest please, please, please help
mel-nik [20]
(6,-9) bc downwards means (-) so -3-6=-9 
8 0
3 years ago
Read 2 more answers
(2/3)(-9/8)(-4/5)(-1)
sertanlavr [38]

Answer: -0.6

Step-by-step explanation:

7 0
2 years ago
Help please, I'm stuck on this :/
nlexa [21]

Do you have a calculator? you can solve it by substituting x.

y=16x^2

0: y = 16(0)^2 = 16(0) = 0

(x = 0 , y = 0)

0.5: y = 16(0.5)^2 = 16(0.25) = 4

(x = 0.5 , y = 4)

1: y = 16(1)^2 = 16(1) = 16

(x = 1 , y = 16)

1.5: y = 16(1.5)^2 = 16(2.25) = 36

(x = 1.5 , y = 36)

2: y = 16(2)^2 = 16(4) = 64

(x = 2 , y = 64)

2.5: y = 16(2.5)^2 = 16(6.25) = 100

(x = 2.5 , y = 100)

3 : y = 16(3)^2 = 16(9) = 144

(x = 3 , y = 144)

4: y = 16(4)^2 = 16(16) = 256

(x = 4 , y = 256)

if you multiply a negative number by itself, it will become positive. So, -4, -3, -2.5, -2, -1.5, -1, -0.5 will be the same as the positive 4, 3, 2.5, 2, 1.5, 1, 0.5.

I'm not sure about the pattern, but if you graph it, it'll be symmetrical across the y-axis.

8 0
3 years ago
A and B are two events.
maria [59]

Answer:

0.8

Step-by-step explanation:

We can solve P(A or B) by using the following:

P(AorB)=P(A)+P(B)-P(AandB)

Since we know P(A) = 0.6, P(B) = 0.3 and P(A and B) = 0.1 we obtain:

P(AorB)=0.6+0.3-0.1=0.8


4 0
3 years ago
Other questions:
  • [100 POINTS]!!!!!!!!!<br> Please Help! Serious answers please
    9·2 answers
  • Events A and B are mutually exclusive. Suppose event A occurs with probability .33 and event B occurs with probability .38.
    12·1 answer
  • Which point lies on the circle represented by the equation (x−1)2+(y−3)2=72? f (8, 3) g (-1, 4) h (1, 3) j (0, 7)?
    5·1 answer
  • Given f(x) = 3x – 2 what is f (2x)?
    13·2 answers
  • Identify the area of the trapezoid. Please help!
    11·2 answers
  • can someone simplify these like terms do not solv just simplify if you do not no how to do this do not try because i need this d
    10·2 answers
  • Ade cycled for 2 hours at an average speed of 15 km/h. Kali travelled the same route as Ade but it took her 2 hour 15 minutes. W
    10·1 answer
  • Based on the equation 6x + 2y = 30, what is the missing value in the table?
    8·2 answers
  • M * 4/5 for m equals 7/8
    7·1 answer
  • 1. Which statement is not true? A. Rational numbers are closed under division. B. Odd numbers are closed under multiplication. C
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!