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12. Which of the following is a quadratic equation?

(1) x2 + 6 = 0
(2) 28-10 = 15
(3) 2r-32 = 2
(4) r+2 =10

1 Answer

0 votes
Answer:
1

Step-by-step explanation:
A quadratic needs a squared term, in this case x2
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