SOLUTION: If one root of the equation 2x2 + 3x – k = 0 is 6, what is the value of k? (A) 90 (B) 42 (C) 18 (D) 10 (E) –10

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Question 3424: If one root of the equation 2x2 + 3x – k = 0 is 6, what is the value of k?
(A) 90
(B) 42
(C) 18
(D) 10
(E) –10
Answer by davidananikian(2) About Me  (Show Source):
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If one root of the equation 2x2 + 3x – k = 0 is 6, what is the value of k?
Find k: substitute x=6
2*6^2+3*6-k=0
90-k=0
k=90