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(3x + 2) ^2 + (x -5) (x + 5)
Va rog multt ajutati-mã


Răspuns :

(3x+2)²+(x-5)(x+5)=
9x²+2*3x*2+2²+x²-5²=
9x²+12x+4+x²-25=
10x²+12x-21