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Creating Polynomial Functions
(Equations) from Rational & Irrational Roots
***********= *********************************
Given Rational and Irrational Roots: &=
nbsp; (
+ 2 ) , ( 2 +
) ,=
( 2 –
)
<=
![endif]> &=
nbsp; &nbs=
p;
&=
nbsp;
-4 -3 -2 -1 0 +4
Roots: X =3D 2 –
&=
nbsp; &nbs=
p; =
X =3D + 2 =
X =3D 2 +
Factors: ( X – 2 ) &= nbsp; &nbs= p; X2 – ( R1 + R2 ) = X + ( R1R2) =3D X2 ­= ;– 4X – 1
Equat= ion (Function): Y =3D = + X3 – 5X2 + 7X + 2
Changing all signs generates an equivalent =
but negative
polynomial: Y =3D – X3 + 5X2 &sh=
y; 7X
2
To do th= is (–) equivalent generation change all signs of (x) terms then to check factor the equation.
<= o:p>
***********= *********************************
Given Rational and Irrational Roots: &=
nbsp; (
+ 2 ) , ( 3 +
) ,=
( 3 –
)
<=
![endif]> &=
nbsp; &nbs=
p; &=
nbsp; &nbs=
p; &=
nbsp; &nbs=
p; &=
nbsp;
&= nbsp; = -4 -= 3 -2 -1 0 +1 +2 +3 +4
Roots: X =3D=
– 2 X =
=3D 3 –
=
X
=3D 3 +
Factors: ( X + 2 ) &nb= sp; = X2 – ( R1 + R2 ) X + ( R1R2) =3D X2 + 6X + 7
Equat= ion (Function): Y =3D= + X3 + 5X2 + X – 7
Changing all signs generates an equivalent =
but negative
polynomial: Y =3D – X3=
sup>
– 5X2 – X + 7
To do th= is (–) equivalent generation change all signs of (x) terms then to check factor the equation.
***********= *********************************
Creating Polynomial Functi= ons with Ration and Irrational Roots tends to be a little more difficult
but using the handy dandy = Abstract Trinomial generator X2 – ( R1 + R2 ) X + ( R1R2)= does help!
It is derived from (X – R1 ) ( X – R2 ) =3D ( X2 –
R1X =
–
R2 X + R1 R2 ) =3D =
X2 – =
( R1
+ R2 ) =
X + R1R2.
Since Given Roots of: = R1 & R2 thus X =3D + R1 and X =3D + R2 and therefore (= X – R1 ) ( X – R2 ).
Tom Love =
&nb=
sp;
=