find the value of the expression 9x⁴ + 4y⁴ + 12x²y², when x=3 and y=4.
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Step-by-step explanation:
Substitute the values in eqn
9(3)^4 + 4(4)^4 + 12 (3)^2(4)^2
729+1024+1296
3029
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