" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
diperoleh :
a = 1
b = 2p-3
c = 18
mis:
akar"nya α dan β
α=2β
α+β = -b/a
= -2p+3/1
= -2p+3
α×β = c/a
= 18/1
= 18
jadi,
α×β = 18
2βxβ = 18
2β² = 18
β² = 9
β = +3 dan -3
α+β = -2p+3
2β+β = -2p+3
3β = -2p+3
β = -2p+3
3
untuk β = 3
maka ; β = -2p+3 : 3
3 = -2p+3 : 3
9 = -2p+3
2p = -6
p = -3
untuk β = -3
maka ; β = -2p+3 : 3
-3 = -2p+3 : 3
-9 = -2p+3
2p = 12
p = 6
= -2p+3/1
= -2p+3
axb= c/a
=18/1
= 18
a=2b , jadi
axb=18
2bxb=18
2b^2=18
b^2 =18/2
b^2 = 9
b =+/- 3
jika b = +3, maka a= +6. jika b= -3 maka a= -6
jika a dan b (+)
a+b= -2p+3
3+6=-2p+3
9-3 = -2p
6= -2p
p= -3
jika a dan b (-)
a+b= -2p+3
-3-6=-2p+3
-9-3 = -2p
-12= -2p
p= 6
jd p ada 2 kemungkinan. tergantung yg diketahui di soal p>0 atau p<0
persamaannya jd ada 2
1.) x^2-((2.(-3)-3)x+18=0
x^2-(-6-3)x+18
x^2+9x+18
(x+3)(x+6)
x= -3 atau x= -6
2.) x^2-((2.(6)-3)x+18=0
x^2- (12-3)x+18
x^2-9x+18
(x-3)(x-6)
x= 3 atau x=6