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Verified answer
6^x^2+2x+1 =(6^-3)^-2x^2+5x+2x²+2x+1 = 6x²-15x-6
x²-6x²+2x+15x+1+6=0
-5x²+17x+7=0
5x²-17x-7=0
rumus abc -b±√b²-4ac/2a
-(-17)±√(-17)²-4(5)(-7) /2(5)
17±√289+140/10 = 17±√429/10
jadi x=17+√429/10 atau x=17-√429/10