A marathon runner runs at 7.6 mph for three and a half hours. how many miles has he run?
1 answer:
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Step-by-step explanation:
First, let's move the to the right-hand side so we can determine what constant we'll need on the left-hand side to complete the square:
From here, since the coefficient of the term is
, we know the square will be
(since
it's half of
).
To complete this square, we will need to add to both sides of the equation:
Now we can take the square root of both sides to figure out the solutions to :
Answer:
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.