Question

7 x ao quadrado + 13 x - 4 =​

Answer 1

7x²+13x-4= 0

a=7

b= 13

c= -4

b²-4ac=∆

13²-4.7.(-4)= ∆

169 + 112= ∆

281 = ∆

x= (-b±√∆)÷2a

x'

x= (-13 +√281)/2.7

x=( -13+16,76)/14

x= 3,76/14

x"

x= (-13 -√281)2.7

x= (-13-16,76)/14

x= -29,76/14