Question

4xao quadrado -20x-25=0

Answer 1

$4x^{2} -20x-25=0= \Delta= b^{2} -4.a.c= \Delta= 20^{2} -4.4(-25)= \Delta=400+400=800  x1=-20-+ \sqrt{800} /2=-10 \sqrt{800} x^{2} =-20-+ \sqrt{800} /2=10 \sqrt{800}$


Espero ter ajudado