To factor 6x4 + 23x2 + 20 ,
use the form (__x + __)(__x + __),
noting that here, the acting variable is " x2 " rather than "x",
the product of the first and third blanks must be "6",
and the product of the second and fourth blanks must be "20".
Test your guesses using the middle coefficient "23", to get:
6x4 + 23x2 + 20 = (2x2 + 5)(3x2 + 4).
No more factoring is possible.
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