Question

Encuentre los dos valores de x que satisfacen la ecuación .7x2+21x-28=0

Answer 1

7x²+21x-28 = 0
(7x+28)(x-1) = 0 <= factorizando.
7x+28 = 0 | x-1 = 0
7x= -28 | x = 1
x= -28/7 | x = 1
x1 = -4 | x2 = 1 <= Rpta.