after taking nine test Carols average grade in her Italian classes 90 her teacher drops the lowest of the nine test scores to de
termine the final grade of Carols final grade is 91 what was her lowest test score
1 answer:
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Add 1 to both sides:
In cases like this, we have to remember that a root is always positive, so we can square both sides only assuming that
Under this assumption, we square both sides and we have
The solutions to this equation are
But since we can only accept solutions greater than -1, we discard and accept
.
In fact, we have
and
which is the only solution.
