Nice Algebra Math Simplification | Algebra | Find the Value of X | Olympiad

[@brianday67]

3 just by looking at it.

[@YashinArafatRafi]

Thanks sir

[@herbertklumpp2969]

Easy x=3 conlude x^3+x - 30 = ( x-3)* ( x^2 -3x +10)=0 Solve the quadratic Equation complex solutions thats all

[@tharanathakula3588]

X = 3 transpose X in the equation to other side to satisfy the equation

[@VELenergo]

х1=3 _________________ х2+3х+10=0 х2+3х+10-7,75=0-7,75 х2+3х+2,25=-7,75 (х+1,5)2=-7,75 х+1,5=+-sqrt(-7,75) х=+-j•sqrt(7,75)-1,5 х2=+jsqrt(7,75)-1,5 х3=-jsqrt(7,75)-1,5

[@dr.m.k.hardaha4114]

The number has to be positive. X^3 + x = 30 X[X^2 +1] =30 Factors of 30 are 2, 3 and 5 X can't be 5 It has to be 3 X=2 does not fit

[@stealthragnarr2644]

X = 3, that's it 😮😮😮

[@madurappankalyanaraman8015]

X should be equal to 3 3³ +3= 27+3=30

[@Christopher-e7o]

X,2x+5=8

[@bayuafrianto276]

Is 3 just to look by number and think hahaha

[@hottuamanullang8046]

3

[@bradramsay8299]

Ok, but let's assume it's not something as obvious as 3 in the first step. How would you approach this problem? What if it's x^3+x=40? Doing x^3-27+x-3 is no longer useful. You pretty much just skipped the most important step.

[@theultimateidiot7943]

And u pretty much just skipped the mean of the problem, solve it for me without calculator then please

[@robertlunderwood]

@@bradramsay8299 Rational root theorem. The worst case scenario would be the cubic formula.

[@Shivsingh-e3z]

X is equal to 3

[@morelibrahimtraore9389]

3*3*3 + 3 = 30

[@subratabiswas2502]

x^3+x-30=0 ; i,e x^3-27+x-3=0 ; i,e (x-3)(x^2+3x+9)+1(x-3)=0 ; i,e (x-3)(x^2+3x+9+1)=0 ; i,e (x-3)(x^2+3x+10)=0 ; i,e x=3 or x= (-3+√31i)/2 or (-3-√31i))2

[@earlwoodland1873]

3 is only a partial answer. Since this is a cubic equation it ha 3 answers. One real and two imaginary.

[@horuxs]

X is 3 . 1 sec for solution

[@ChuckyTheHorrorSouthParkLover]

Yeah that was easy

[@Halina-cg8zo]

3

[@ChuckyTheHorrorSouthParkLover]

3

[@pas6295]

3

[@gopalsinnarkar277]

3

[@chinnu8038]

3

[@rajendransubramanium5650]

3

[@Stopthegyattbots]

3

[@LightningBFDI-e4r]

3