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calculati . (3x+2)²+(x-5)(x+5)=?

Răspuns :

(3x)²+2·3x·2+2²+(x²-5²)=9x²+12x+4+x²-25=10x²+12x-21
9 x^2+4+ x^{2} +5x+25=10 x^{2} +5x+29.
sper ca te-am ajutat.