Question

resolva as seguintes equações do 2 grau
a) 15x2=-25x

Answer 1

15x²=-25x
15x²+25x=0
5x*(3x+5)=0
x'=0
x''=-5/3

Answer 2

15x²+25x=0
a=15 b= 25 c=0
∆=b²-4ac
∆=25²-4•15•0
∆=625

x=-b+/-√∆
_________
2a

x= -25+/-√625
__________
2•15

x= -25+/-25
________
30

x¹= -25+25
_______
30

x¹= 30

x²= -25-25
_______
30

x²= -50
____
30

x²= -5
___
3