Question

Which is zero of the polynomial expression 7x+21

Answer 1

The expression will have a zero when it’s equation is equal to zero:

7x+21=0

Now solve for x, start by isolating the variable (x) by subtracting 21 from both sides

7x = -21

The only thing stopping c from being by itself is 7, so we divide both sides by 7 to isolate x

x = -3

Answer 2

Answer:

The zero is x = -3

1. Use the Rational Zero Theorem to list all possible rational zeros of the function.
2. Use synthetic division to evaluate a given possible zero by synthetically dividing the candidate into the polynomial.
3. Repeat step two using the quotient found with synthetic division.

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