The approximate value of -8 + √20 is -3.5.
According to the given question.
We have a word phrase " negative eight plus the square root of twenty".
The expression for the above word phrase is
-8 + √20
The above expression can be written as
-8 + √4(5)
Now, the approximate value of the given expression -8 + √20 is given by
= -8 + 2√5
= -8 + 2(2.23)
= -8 + 4.47
= -8 + 4.5
= -3.5
Hence, the approximate value of -8 + √20 is -3.5.
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