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
vfiekz [6]
3 years ago
10

-8x^2+4x+5=0 using quadratic formula

Mathematics
1 answer:
daser333 [38]3 years ago
6 0
So you want to solve for x?

It would be nice if this would easily factor:
(-4x + 5)(2x +1)  = 0    This will not work!

So you need to use the quadratic formula:
a = -8, b = 4, c = 5

x = \frac{-b+/-  \sqrt{b^{2}-4ac} }{2a}

x = (-4 +/- \sqrt{16-4(-8)(5)})/2(-8)
   = (-4 +/- \sqrt{16 + 160})/-16
   = (-4 +\sqrt{176})/-16
   = 1/4 - \sqrt{11}/4

You might be interested in
A basketball player that shoots 80% from the free throw line attempts two free throws. The notation for conditional probability
taurus [48]

Answer:

P(made 2nd attempt|made 1st attempt)=P(made 2nd attempt)

Step-by-step explanation:

Here given that a basketball player that shoots 80% from the free throw line attempts two free throws.

If x is the no of shoots he makes (say) then we find that each throw is independent of the other.

In other words, because he made successful first attempt, his chances for second attempt will not change

Prob for success in each attempt remains the same as 0.80

Hence I throw is independent of II throw.

When A and B are independent,then we have

P(A/B) = P(A)

Hence answer is

P(made 2nd attempt|made 1st attempt)=P(made 2nd attempt)


8 0
3 years ago
Plz reanswer it If (x+4): (3x+1) is the duplicate ratio of 3:4 find the value of x.​
Rzqust [24]
Answer: x = 13/5

Explanation:

(x+4)/(3x+1) = 3/4

Cross multiply:

4(x+4) = 3(3x+1)
4x + 16 = 9x + 3
4x - 9x = 3 - 16
-5x = -13
x = -13/-5
x = 13/5
3 0
3 years ago
Read 2 more answers
8+a=21 plssssssssssssszzzz​
attashe74 [19]

Answer:

13

Step-by-step explanation:

because a is the missing number. Well, 21 minus or -  8 is equal to 13.

8 0
3 years ago
I need help solving 2x+7=x+3
mart [117]
2x+7=x+3

2x+7=3
-×

x+7=3
-7 -7

x=-4
8 0
3 years ago
Read 2 more answers
What’s the answer pls
MAXImum [283]
37.1
35 * .06 = 2.1
35 + 2.1 = 37.1
8 0
3 years ago
Other questions:
  • I need help with these three problems please​
    10·2 answers
  • If there are 15 boys in a class of 25 students,what is the ratio of girls to boys in the class
    10·2 answers
  • Part 1: Create your own quadratic equation that cannot be solved by factoring, but can be solved using the quadratic formula. Id
    7·2 answers
  • What is the solution set of x^2+y^2=26 and x-y=6
    11·2 answers
  • A bag contains 3 red balls and 2 blue balls. A ball is taken at random from the bag and then put back. And then a second ball is
    10·1 answer
  • Find the height of a cylinder with a surface area of 108 pi square meters. The radius of the cylinder is twice the height.
    6·1 answer
  • Find KI if GI = 3.2<br> Can anyone help??
    11·1 answer
  • Which expression is equivalent to 5/6 ÷ 4
    12·1 answer
  • Determine the distance between the two points (1, -3) and (-4, 3) plotted on the graph below.
    7·1 answer
  • What value in Vertex Form moves the graph up?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!