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Mihaelaalina801
a fost răspuns

3 (x+5)-(2x-1)la puterea2 -13=5 (1-x)(1+x)+(x-3) la puterea 2

Răspuns :

SignOfTheTimes
3(x+5)-(2x-1)²-13 = 5(1-x)(1+x)+(x-3)²
3x+15-(4x²-4x+1)-13 = 5(1-x²)+x²-6x+9
3x+15-4x²+4x-1-13 = 5-5x²+x²-6x+9
-4x²+7x+1 = -4x²-6x+14
7x+6x = 14-1
13x = 13
x = 13/13
x = 1.


Succes!

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