Answer:
75
Explanation:
You want the value of y² +4y -2 when y=7.
Substitution
Put the value where the variable is and do the arithmetic.
7² +4·7 -2
= 49 +28 -2
= 77 -2
= 75
The value of the expression is 75.
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Additional comment
It is often easier to evaluate a polynomial when it is written in Horner form:
(y +4)·y -2
= (7 +4)·7 -2 = 11·7 -2 = 77 -2 = 75
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