Question

x4 + x2 + 1 [Hint: Add and subtract x?.]​

Answer 1

Answer:

x4+x2+1=0

Explanation:

• x4+x2+1+x2-x2
• x4+x2+1-x2
• [x2+1]2-x2     [a2+2ab+b2=(a+b)2]
• [x2+1+x][x2+1-x]          [a2-b2=(a+b)(a-b)