2x^3 + x^2 - 5= 0
x=?
What is the process I must do in order to get the answer?
3 answers
See your previous post
first guess
when does 2x^3 + x^2 = 5 ???
x | 2 x^3, x^2 , sum
o | 0 , 0 , 0
.5| .25 , .25 , .5
1 | 2 , 1 , 3
1.5| 6.75 , 2.25 , 9 yikes, try 1.25
1.25| 3.91 , 1.56 , 5.47 getting there
1.2 | 3.456 , 1.44 , 4.896
so between 1.2 and 1.25
1.22| 3.632 , 1.488 , 5.12
1.21| 3.543 , 1.464 , 5.007 close enough
so
x = 1.21 works
now you need 2 more roots
divide 2x^3 + x^2 - 5
by (x-1.21)
solve the resulting quadratic
when does 2x^3 + x^2 = 5 ???
x | 2 x^3, x^2 , sum
o | 0 , 0 , 0
.5| .25 , .25 , .5
1 | 2 , 1 , 3
1.5| 6.75 , 2.25 , 9 yikes, try 1.25
1.25| 3.91 , 1.56 , 5.47 getting there
1.2 | 3.456 , 1.44 , 4.896
so between 1.2 and 1.25
1.22| 3.632 , 1.488 , 5.12
1.21| 3.543 , 1.464 , 5.007 close enough
so
x = 1.21 works
now you need 2 more roots
divide 2x^3 + x^2 - 5
by (x-1.21)
solve the resulting quadratic
Hey Fred, read previous answers before posting again.
1 answer