The question in my trig homework reads, |2t+5|< 3 I get the answer -1>t>-1 but my answer key to check my answers says this is the wrong answer. I'm not sure where I went wrong?
|2t+5|< 3
To solve this kind of problem, let's take the expression out of the absolute value bars and solve two equations:
2t + 5 < 3 and -(2t + 5) < 3
The reason for this is that if, lal < b, then l-al is also < b........!!!!
Working with the frist one, we have....
2t < -2 divide by 2 on each side
t < -1
Working with the second one, we have
-2t - 5 < 3 add 5 to both sides
-2t < 8 divide by -2 on both sides and reverse the sign
t > -4
So the solution is given by
-4 < t < -1
Here's a graph here ... https://www.desmos.com/calculator/q7apmwkdop
( I've substitued "x" for "t" but it's the same idea !!)......
|2t+5|< 3
To solve this kind of problem, let's take the expression out of the absolute value bars and solve two equations:
2t + 5 < 3 and -(2t + 5) < 3
The reason for this is that if, lal < b, then l-al is also < b........!!!!
Working with the frist one, we have....
2t < -2 divide by 2 on each side
t < -1
Working with the second one, we have
-2t - 5 < 3 add 5 to both sides
-2t < 8 divide by -2 on both sides and reverse the sign
t > -4
So the solution is given by
-4 < t < -1
Here's a graph here ... https://www.desmos.com/calculator/q7apmwkdop
( I've substitued "x" for "t" but it's the same idea !!)......