quadratic methods
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
---|---|---|---|---|---|
Define Quadratic equation | A second degree equation written as ax^2+bx+c=0
🗑
|
||||
solve 2x^2+5x+3=0 | x=(-5±√(5^2-4*2*3))/(2*2)
x=(-5±√(25-24))/4
x=(-5±√1)/4
x=(-5±1)/4
x=(-5+1)/4 or (-5-1)/4
x=-1 or x= - 3/2
🗑
|
||||
4x^2=8x-13 | 4x^2-8x+13=0
x=(-(-8±√(-8^2-4*4*13))/2*4
x=(8±√(64-208))/(8)
x=(8±√-144)/8
x=1+(3/2)i and 1-(3/2)i
🗑
|
||||
b^2-4ac is called what? | the discriminant
🗑
|
||||
if b^2-4ac=0 | the equation has 2 real numbers
🗑
|
||||
if b^2-4ac>0 | the equation has 2 unreal number solutions
🗑
|
||||
if b^2-4ac<0 | the equation has two complex number soultions
🗑
|
||||
find discrimant results for x^2-4x-5=0 | b^2-4ac (a=1, b=4, c=-5)
(-4)^2-(4*1*5)
16+20=36
36>0
therfore the equation has 2 unequal real number solutions
🗑
|
||||
find discrimant results for 4x^2-2+5=0 | b^2-4ac (a=4, b=-2, c=5
(2)^2-(4*4*5)
4-80=-76
-76<0
therefore this equation has 2 complex number soultions
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
1267290182
Popular Math sets