Mathematics
22 Online
OpenStudy (anonymous):
Which of the following are solutions to the equation below?
Check all that apply.
3x2 + 27x + 54 = 0
A. -6
B. -3
C. 6
D. 3
E. 9
F. -27
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OpenStudy (anonymous):
@welshfella
OpenStudy (welshfella):
tomake it a little easier you can divide each term by 3
OpenStudy (welshfella):
giving
x^2 + 9x + 18
OpenStudy (welshfella):
can you thinl of 2 numbers whose product is 18 and sum is 9?
OpenStudy (anonymous):
i have to find what goes into 27 and 54?
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OpenStudy (welshfella):
- iv dodne that for you to give an easier equation
OpenStudy (anonymous):
what is product?
OpenStudy (anonymous):
=?
OpenStudy (anonymous):
3*6 3+6
OpenStudy (welshfella):
product mean result when 2 nubers are multiplied
like 6 is the product of 2 an 3
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OpenStudy (welshfella):
Yea you got it 3 and 6 are the 2 numbers we want
OpenStudy (welshfella):
so factors are (x + 3(x + 6) = 0
so the roots are what?
remember what we did for the other equation
OpenStudy (anonymous):
sub the opposite?
OpenStudy (welshfella):
x+ 3 = 0 or x + 6 = 0
so x = what? or what?
OpenStudy (welshfella):
x + 3 = 0
x + 3 -3 = 0 - 3
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OpenStudy (welshfella):
so x = ?
OpenStudy (anonymous):
-3 -6?
OpenStudy (welshfella):
-3 and -6 yes
OpenStudy (anonymous):
thank you <3
OpenStudy (anonymous):
will it ever be positive?
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OpenStudy (welshfella):
yw I think you are understanding it a bit more now
OpenStudy (welshfella):
yea
if for example
x - 3 = 0
then x - 3 + 3 = 0 + 3
x = 3
OpenStudy (anonymous):
oh okay