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Question

Solve for x : 12x3+1x5=119,x32,5

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Solution

12x3+1x5=109x5+2x3(2x3)(x5)=1093x82x(x5)3(x5)=1093x82x210x3x+15=1093x82x213x+15=10927x72=20x2130x+15027x+130x=20x2+72+150157x=20x2+22220x2+222157=020x2157x+222=0
It is i form ax2+bx+c=0
So by applying ShreedharAcharya formula
(157)±(187)24×20×2222×20=157±246491776040=157±688940=157+8540or1878540=6or1.85

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