SOLUTION: What is find the value of x^4 - 2x^2 + 1 for x = -4.

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Question 486443: What is find the value of x^4 - 2x^2 + 1 for x = -4.
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
x%5E4+-+2x%5E2+%2B+1
Use formula a%5E2-2ab%2Bb%5E2=%28a-b%29%5E2
x%5E4+-+2x%5E2+%2B+1=%28x%5E2%29%5E2-2%2Ax%5E2%2A1%2B1%5E2=%28x%5E2-1%29%5E2
for x=-4
%28%28-4%29%5E2-1%29%5E2=%2816-1%29%5E2=15%5E2=225