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Numerical Ability
Algebra
x=1+root2+root3 then the value of (2x^4-8x^3-5x^2+26x+28).please give shortcut
1)6root6 2)0
3)3root6 4)2root6
Read Solution (Total 1)
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- x2 = (1+Ö2+Ö3)2 = 6+2Ö2+2Ö3+2Ö6
x3 = (1+Ö2+Ö3)3 = 16+14Ö2+12Ö3+6Ö6
x4 = (1+Ö2+Ö3)4 = 80+48Ö2+40Ö3+32Ö6
2x4 = 2(1+Ö2+Ö3)4 = 160+ 96Ö2+80Ö3+64Ö6
-8x3 = -8(1+Ö2+Ö3)3 =-128-112Ö2-96Ö3-48Ö6
-5x2 = -5(1+Ö2+Ö3)2 = -30- 10Ö2-10Ö3-10Ö6
+26x = 26(1+Ö2+Ö3) = 26+ 26Ö2+26Ö3
-28 = -28
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= + 6Ö6
Answer = 6Ö6 - 8 years agoHelpfull: Yes(0) No(6)
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