Question

x2+x-20=0 slove by completing square method​

Answer 1

Step-by-step explanation:

.,,,,,,hope its help you,,,,,,,

Answer 2

Answer:

given equation is x2+x-20=0 ______(name this equation as 1)

now,

compair middle term with 2ax

2ax= 1x

a=1x/2x

a =1/2 _______(x and x will get cancelled)

according to method now squaring

a2= 1/4

now, add &subtract a2 =1/4 in equation 1

x2 +x+1/4-1/4-20=0

( x+1/2) 2 -(81/4) 2 =0

( x+1/2) -( 9/2) =0

(x+1/2-9/2) (x+1/2+9/2) =0

(x-8/2) (x+10/2) =0

(x-4) (x+5) =0

(x-4=0) (x+5=0)

( x=4) (x= -5)

factors are ( x=4) (x= -5) .......