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( 5 - 2x )(5+2x) + ( 1- 4x ) la patrat =...

Răspuns :

5²-(2x)²+1²-2×4x×1+(4x)²= 25-4x²+1-8x+16x²= 12x²-8x+26
[tex](5-2x)(5+2x)+(1-4x)^2=25-4x^2+1^2-2 \cdot 1 \cdot 4x+(4x)^2= \\ =25-4x^2+1-8x+16x^2=12x^3-8x+26[/tex]