Question

Repede. 3x^2 -20x=7 , x=? Cum se face?

Answer 1

3x²-20x=7

3x²-20x-7=0

3x²+x-21x-7=0

x(3x+1)-7(3x+1)=0

(3x+1)(x-7)=0

3x+1=0

x-7=0

x1=-1/3

x2=7

S={-1/3,7}