how to get the value of a from this equation:
a³ - 19a + 30 = 0

Question

how to get the value of a from this equation:
 a³ - 19a + 30 = 0

triciaal · Answer

factorization

anonymous · Answer

can you show me my friend?

nnesha · Answer

have you ever heard p over q method ?

anonymous · Answer

i didnt

nnesha · Answer

$$\huge\rm \frac{ p }{ q } = \frac{ constant  }{ leading ~coefficient  }$$
what is the constant and leading coefficient in that equation ?

anonymous · Answer

constant is 30

anonymous · Answer

how about the leading coefficient?

nnesha · Answer

$$\huge\rm Ax^2 + Bx +C = 0$$
coefficient of highest degree  variable 
in this equation A is leading coefficient

anonymous · Answer

so its 1

anonymous · Answer

30/1 ? how can we get it?

nnesha · Answer

yep right 
leading coefficient and constant both number write with plus minus sign $$\huge\rm \frac{ \pm 30  }{ \pm1}$$ plus minus 1 would be just one 
now find all  factor of 30

anonymous · Answer

tell me what can i do to get the value of a immediately please

nnesha · Answer

hmm wait that's not right :(

anonymous · Answer

i think the value of a is three..

nnesha · Answer

if you need an answer immediately 
then graph that equation where line cross x-axis's that points would be your answer

nnesha · Answer

highest degree is 3 so 
there would be 3 zeroes

anonymous · Answer

i cant im dumb at this thats why i post it D:

nnesha · Answer

can you give me more information about the statement or topic

anonymous · Answer

this is my geometry :D

nnesha · Answer

aww i'm sorry ;-;