Question 405559
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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