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
ch4aika [34]
4 years ago
12

Please help me solve this for 15 points! -x2 + 4x - 54 = 0​

Mathematics
2 answers:
Mazyrski [523]4 years ago
7 0

Answer:

x1 =2-5i*sqrt(2)

x2 =2+5i*sqrt(2)

Step-by-step explanation:

-x^2 +4x-54=0 (quadratic equation)

a=-1, b=4, c=-54

x1=(-b+sqrt(b^2-4ac))/2a

x1=(-4+sqrt(4^2 - 4*(-1)(-54))/2*(-1)

x1=(-4+sqrt(16-216))/(-2)

x1 =(-4+sqrt(-200))/(-2)

x1 =(-4+sqrt(200i^2))/(-2) i^2=-1

x1 =(-4+sqrt(100*2*i^2))/(-2)

x1 =(-4+10i*sqrt(2))/(-2)

x1 =2-5i*sqrt(2)

x2 =(-b-sqrt(b^2-4ac))/2a

x2 =(-4-10i*sqrt(2))/(-2)

x2 =2+5i*sqrt(2)

Zepler [3.9K]4 years ago
3 0
As a result, 2x = 54 so x = 27. Hope this help:)
You might be interested in
The sum of two consecutive even integers is 26. What is the product of the two integers?
lions [1.4K]
(2x) + (2x + 2) = 26
4x + 2 = 26
4x = 24
x = 6

The numbers are 12 and 14

12*14 = 168
4 0
1 year ago
Use the properties you learned to show why (a+b)+c is equivalent to b+(a+c)
Vlad [161]
Using the Associative Property of addition, if you move the parentheses anywhere between a, b, and c, the answer will always be the same. Also, the Commutative Property of addition states that if you move the terms around, the answer is also still the same. So, (a+b)+c is the same as b+(a+c). 
8 0
3 years ago
-2x+19+12x=49 solve for x
sdas [7]

Answer:

x = 3

Step-by-step explanation:

49 - 19 = 30

-2x - 12x = 10x

30 / 10 = 3

4 0
3 years ago
Read 2 more answers
how many unique triangles can be made where one angle measures 98 degrees and another angle is an obtuse angle
aliya0001 [1]
None because it is impossible for any triangle to have more than one obtuse angle.
7 0
3 years ago
Read 2 more answers
If b = 3 in. and h = 8 in., what is the area of the triangle?
Yakvenalex [24]
The area formula of a triangle is 1/2 ×base ×height

so 1/2×3 in ×8 in ---> 1/2×24 in = 12 in
3 0
3 years ago
Other questions:
  • What is the sales tax for a purchase of $2,500
    10·2 answers
  • Write and solve a word problem that matches the diagram shown​
    10·1 answer
  • Please help thanks!!!
    11·1 answer
  • How to solve 28,32and34
    15·1 answer
  • What goes next 0.125,0.25,0.375, ,
    7·2 answers
  • A penguin leaps out of the water while swimming. This action is called porpoising. The height y (in feet) of a porpoising pengui
    6·1 answer
  • What math sites do you guys use? :/<br>or apps?<br><br>for me I use "Khan Academy"​
    8·2 answers
  • Can someone please answer this please ASAP!!!!
    10·1 answer
  • Pls help! Will make brainliest!!
    6·1 answer
  • Help pls iready math equation
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!