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(3x+5) la patrat+ ( 5x-3) la patrat

Răspuns :

(3x+5)²+(5x-3)²=9x²+30x+25+25x²-30x+9= 34x²+44
9x patrat+15×+25+25xpatrat-15x+9=34 xpatrat +34=34(xpatrat +1)