Question

x 2 + 4x - 5 = 0


x = 1 , x= -1​

Answer 1

Step-by-step explanation:

if x=1

then,

x^2 + 4x - 1=0

(1)^2+4(1)-1=0

1+4-1=0

if x= -1

then,

x^2+4x-1=0

(-1)^2+4(-1)-1=0

1+(-4)-1=0

1-4-1=0

-2=0

Answer 2

Step-by-step explanation:

x²+4x-5 = 0

x = 1

(1)²+4(1)-5

= 1+4-5

=5-5

=0

x = -1

(-1)²+4(-1)-5

=1-4-5

=-8

x=1 is a factor of x²+4x-5