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Ajutor (2×+3)rotu la 2 =49

Răspuns :

(2x+3)²= 4x²+ 12x + 9= 49
4x²+12x=49-9=40
4x(x+3)=40
x+3=40/4x
x+3=10/x | •x
x²+3x= 10
x(1+3)= 10
4 = 10/x
x = 10/4
x = 2,5