It is linear in c and non-linear in d. If both c and d are variables, then it is non-linear.
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If by d2 you mean d squared then it is non linear
It is linear.
5xy+4=9
104
2 squared plus 2 x 3 = 10, 7 squared plus 7 x 2 = 63, 6 squared plus 6 x 5 = 66,8 squared plus 8 x 4 = 96 so 9 squared plus 9 x 7 = 81 + 63 = 144.