7(3x+5) = 11 - (x +9)
2 answers:
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Answer:
-1 and -5
Step-by-step explanation:
You must account for negative u values (which the abs nullifies).
So and
is what we have to solve for.
As for usual equations, isolate the u variable.
5u + 15 = 10
5u + 15 (-15) = 10 (-15)
5u = -5
u = -1
Now you can do the same operation for the other equation and you should get u = -5.
Let's make sure we did it right by replacing u with one of our solutions (-1 or -5).
That's true. What about the other one?