Hi

Solving:  finding roots by setting the function = 0

x^4 - 8x^2 + 16 = 0  |note the use of ^ (uppercase 6)

factoring

(x^2 -4)(x^2 -4)= 0 

Note:SUM of the inner product(-4x^2) and the outer product(-4x^2) = -8x^2

  (x^2-4) = 0

factoring

 (x+2)(x-2) = 0  Note:SUM of the inner product(2x) and the outer product(-2x) = 0 

 (x+2)= 0   x = -2

 (x-2)= 0   x =  2

 

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