In a quiz competition, a student answers n questions corr...
In a quiz competition, a student answers n questions correctly and was given D(n + 50) for each question correctly answered. If he gets D600.00 altogether, how many questions did he answer correctly?
18
15
12
10
Correct answer is D
let the number of question = n
n(n + 50) = 600
n2 + 50n - 600 - 0 by quadratic formular
x = b±√b2−4ac2
n = −50±√502−4(1)(−600)2(1)
= −50±√49002
= −50+702
= 202
= 10
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