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3(x-2)^2+(x-5)(x+5)-2x(x-6) =?

Răspuns :

3(x-2)²+(x-5)(x+5)-2x(x-6)
3x²+4+x²-25-2x²+12x
2x²-19+12x

3(x²-4x+4)+(x²-5²)-2x²-12x=
3x²-12x+12+x²-25-2x²-12x=
x²+13
 cele ingrosate le tai