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3(5)^3+4(5)^2-6
3(125)+4(25)-6
375+100-6
469
b) x=-3
3(-3)^3+4(-3)^2-6
3(-27)+4(9)-6
-81+36-6
-39
c)x=-4
3(-4)^3+4(-4)^2-6
3(-64)+5(16)-6
-129+80-6
-55