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If x2+2=2x then the value of x4−x3+x2+2 will be,
0
1
-1
2
The very first step that we will take is to transpose the equation 1 to have a numerical value on the right of the equality sign. We intend to factor the target expression with this transposed expression, x2−2x=−2. Factoring this way we get expression, E=x2(x2−2x)+2x3−x3+2x=x3−2x2+2x. We have straightaway simplified the tail by using x2+2=2x for substitution. So, E=x(x2−2x)+2x=−2x+2x=0
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