Question

simplify -x^2-2x+4=0 some technique other than square root formula

Answer 1

use product of root(POR) and sum of root(SOR)

Answer 2

would you do it for me, step by stepa

Answer 3

POR=Product Of Root
SOR=Sum Of Roots
take -x^2-2x+4=0 change it to x^2+2x-4=0
(POR)A+B =2
(SOR)AB=-4
modify
A+B=2 to A=2-B
then insert to
(2-B)B=-4
expand to
2B-B^2 =-4
then arrange to B^2-2B-4
then use formula for root
got B=3.236 or B=-1.236
insert into A=2-B
finally
A=3.236 or A=-1.236

Answer 4

POR=Product Of Root
SOR=Sum Of Roots
X^2-(SOR)X + (POR)=0
take -x^2-2x+4=0 change it to
x^2+2x-4=0 same as
x^2-(-2)-4=0
(POR)A+B =-2
(SOR)AB=-4
modify
A+B=-2 to A=-2-B
then insert to
(-2-B)B=-4
expand to
-2B-B^2 =-4
then arrange to B^2+2B-4
then use formula for root
got B=-3.236 or B=1.236
insert into A=-2-B
finally
A=-3.236 or A=1.236

Answer 5

the new one is the correct one

Answer 6

POR=Product Of Root
SOR=Sum Of Roots
X^2-(SOR)X + (POR)=0
take -x^2-2x+4=0 change it to
x^2+2x-4=0 same as
x^2-(-2)x-4=0
(POR)A+B =-2
(SOR)AB=-4
modify
A+B=-2 to A=-2-B
then insert to
(-2-B)B=-4
expand to
-2B-B^2 =-4
then arrange to B^2+2B-4
then use formula for root
got B=-3.236 or B=1.236
insert into A=-2-B
finally
A=-3.236 or A=1.236

Answer 7

this one got no typing error~~ sorry for the mess

Answer 8

thank you very much student 91 it helps a lot! jesusin