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Y²+4y-2 evaluate the expression when y=7​

User Yana
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1 Answer

4 votes

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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User Marshall An
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