Hi

Find all of the zeros of each function:

 f(x)=4x^4+19x^2-63 = (4x^2 -9)(x^2 +7) = 0 

(4x^2 -9)=0   x = ±  REAL solution

(x^2 +7) = 0  x = ±i

checking our Factoring Using the FOIL Method

4x^4+19x^2-63 = (4x^2 -9)(x^2 +7)

F	First terms 4x^2

O	Outside terms 28x^2

I	Inside terms  -9x^2

L	Last terms    -63

 

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