Question

Sa se rezolve ecuatia:
a) (x+3)² +3 (x-2) (x+2) = (2x-5)²

Answer 1

$x^{2} +6x+9+3( x^{2} -4)=4 x^{2} -20x+25 \\ x^{2} +6x+9+3 x^{2} -12=4 x^{2} -20x+25 \\ 6x+20x=25-9+12 \\ 26x=28 \\ x= \frac{28}{26} \\ x= \frac{14}{13} \\ S={ \frac{14}{13} }$