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E(x) = (2x-3)^2 - 3x( X-4 ) + ( 1 - X ) ( 1 + X )

Răspuns :

E(x) = (2x-3)² - 3x( x-4 ) + ( 1 - x ) ( 1 + x )=

= 4x²-12x+9  -3x²+12x+1-x²=       (termenii cu bold se reduc)

=4x²-4x²+10=

=10

Solutie: E(x)=10