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calculand (5x-3) la puterea 2 -(4x-2) la puterea 2

Răspuns :

Se scad puterile si ramane (5x-3)-(4x-2)=x-1
(5x-3)² -(4x-2)²=
aplicam formula a²-b²=(a+b)(a-b)
=(5x-3+4x-2)(5x-3- 4x+2)=
=(9x-5)(x-1)=
=9x²-5x-9x+5=
=9x²-14x+5