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Given that C varies partly as A and partly as the square of A and that C=20 when A= 2 and C=21 when A=...

Given that C varies partly as A and partly as the square of A and that C=20 when A= 2 and C=21 when A= 3, determine the value of C when A = 4.

Answers

C =hA+kA²
20=2h+4k
h+2k=10…………..(i)
21=3h+9k
h+3k=7…………….(ii)
h+3k=7
h+2k=10
k=-3
h-6=10
C=16a-3a²
C = 16 x 4-3 x16
C = 64-48
C = 16

Kavungya answered the question on September 21, 2019 at 07:29

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