1. 16x^4 - 1 =
3. 3x^4 + 15x^2 - 72 = 0,
X = +- 2.19.
EXCEL Spreadsheets were used.
4. x^3 + 2x^2 - x = 0,
2. 4x^4 + 39x^2 - 10 = 0.
A*C = 4*(-10) = -40 = -1*40.
4x^4 + (-x^2+40x^2) -10,
Group terms into factorable pairs:
(4x^4 - x^2) + (40x^2-10) =
x^2(4x^2-1) + 10(4x^2-1) =
Unless I am mistaken, you may want to check the EXCEL spreadsheet results.
3x^4+15x^2-72=0 factors well to
which gives x=0, or
#3. Your procedure was easy to follow:
I will use it on similar problems.
EXCEL doesn't work properly when imaginary numbers are involved.
Thanks for the INFO!
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