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1.) y=(2x-1)^2 dan y=3x+5
=4x^2-4x+1
y=y
4x^2-4x+1=3x+5
4x^2-7x-4=0
(A=4 B=-7 C=-4)
Diskriminan:
b^2-4ac
(-7)^2-4•4•(-4)=49-(-64)=113
2.) y=ax^2+3x+6 dan y=2x-1
y=y
ax^2+3x+6=2x-1
ax^2+x+7=0
(A=a B=1 C=7)
Diskriminasi:
b^2-4ac=-27
1^2-4•a•7=-27
1-28a=-27
-28a=-28
a=-28/-28= 1
Maka a+1=1+1=2