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# Find the zeros of Q(r) = 2r^2 -16r + 30 by factoring. Answers should be in increasing order.?

r = ?

r = ?

### 3 Answers

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- KrishnamurthyLv 71 month ago
Q(r)

= 2r^2 - 18r + 30

= 2(r^2 - 9r + 15)

= 2 (r - 9) r + 30

= r (2 r - 18) + 30

Roots:

r = 9/2 - sqrt(21)/2

r = 9/2 + sqrt(21)/2

- RobertLv 71 month ago
First, set Q(r) = 0:

2r^2 - 16r + 30 = 0 Divide by 2:

r^2 - 8r + 15 = 0. Factor:

(r - 3)(r - 5) = 0

So r = 3, and r = 5

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