A bar model can be used to a subtraction problem by showing how much of it your actually losing or winning so subtract the totals and you have gotten your answer.
Let z = 3x+2. Then, by substitution, your equation is
.. z^2 +7z -8 = 0
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This equation can be factored as
.. (z +8)(z -1) = 0
.. x = -8 or +1
Then
.. 3x +2 = -8 or +1
.. 3x = -10 or -1
.. x = -10/3 or -1/3
The answer is: x= 5/12 or x=0.416
Answer:
2.3 liters
Step-by-step explanation:
800 ml (milliliters) = 0.8 l (liters)
1.5 + 0.8 = 2.3 l