Question

Resolva usando a fórmula de Bhaskara

25x² = 20x -4

Answer 1

a=25 b=20 c= -4

∆=b²-4.a.c

∆=20²-4×25×(-4)

∆=400-100×(-4)

∆=400-(-400)

∆=400+400

∆=800

Answer 2

25x²-20x+4=0 ---> a=25 b=-20 c=+4

∆=b²-4.a.c

∆=(-20)²-4.25.4

∆=400-400

∆=0

x=-b±√∆

__________

2

x=-(-20)±√0

____________

2

x=20±0

________

2

x1=20/2 ---> x1=10

x2=20/2 ---> x2=10

nos dois casos, somando e subtraindo o x vai dar 10