Question

x.(x+1)=30 equaçao de 2 grau por baskara

Answer 1

x² + x = 30
x² + x - 30 = 0

a= 1
b= 1
c = -30

x = - b + - V b² - 4ac / 2a

x = - ( 1 )  + - V 1² - 4 . 1 . - 30 / 2 . 1
x = - 1 + - V 1 + 120 / 2
x = - 1 + - V 121 / 2
x' =  - 1 + 11 / 2 = 10 / 2 = 5
x" = - 1 - 11 / 2 = - 12 /2 = - 6

Answer 2

x(x+1)=30
x²+x=30
x²+x-30
Δ= b²-4ac
Δ=(1)²-4·1·(-30)
Δ= 121

x'= -b +√Δ/2a
x'= -1+√121/2
x'= -1+11/2
x'= 10/2
x'=5

x''= -b-√Δ/2a
x''= -1-√121/2
x''= -1-11/2
x''= -6

S:[-6,5]