C3 Modulus
How would you work out |3x+2| = 1 ?
Would you use the same method as with inequalities?
Would you use the same method as with inequalities?
Try using the "squaring method" for simple questions like these. Here's how to do it:
Square both sides:
Solutions: or
Square both sides:
Solutions: or
Original post by subzero0137
Try using the "squaring method" for simple questions like these. Here's how to do it:
Square both sides:
Solutions: or
Square both sides:
Solutions: or
You probably want to note that the question in the OP is , not .
Also please don't give out full solutions straight away. (I admit it is possible you changed the 2 to a 1 on purpose, in which case I'd suggest that as an example this is too similar)
(edited 12 years ago)
Original post by eckothegecko
How would you work out |3x+2| = 1 ?
Would you use the same method as with inequalities?
Would you use the same method as with inequalities?
Well you know that 3x+2=1 or -(3x+2)=1
work out the answer to x in each case.
x=(1-2)/3 or x=3/3
x=-1/3 or 1
the moduls just means what ever the equation is; negative or positive it has to become positive.
therefore
could be
so you can have two answers, try using both of these answers and solve the equation
you should get two different answers for x
put these two x values into your origional equation of y=... and you will get the two y values
therefore
could be
so you can have two answers, try using both of these answers and solve the equation
you should get two different answers for x
put these two x values into your origional equation of y=... and you will get the two y values
Original post by EEngWillow
You probably want to note that the question in the OP is , not .
Also please don't give out full solutions straight away. (I admit it is possible you changed the 2 to a 1 on purpose, in which case I'd suggest that as an example this is too similar)
Also please don't give out full solutions straight away. (I admit it is possible you changed the 2 to a 1 on purpose, in which case I'd suggest that as an example this is too similar)
Oh...my bad.
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