Finding Zeros

FACTORING (Notes)

x^3+ 5x^2-4x-20
x^2(x-5)-4(x+5)
(x+5)(x^2-4)
(x+5)(x-2)(x+2)

Zeros for this Polynominal are: (-5,0)(2,0)(-2,0)

x^3+4x^2-9x-36
x^2(x+4)-9(x+4)
(x^2-9)(x+4)
(x-3)(x+3)(x+4)
Zeros for this Polynominals: (3,0)(-3,0)(-4,0)

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#1 LET y=x^2 & y^2 =x^4

2x^4 -x^2-3
2y^2-y-3
(2y-3)(y+1)
2y-3=0 or y+1=0
y=1.5 or y=1

x^2=1.5 or x^2=-1


#2

x^4-5x^2+4
y^2-5y+4
(y-4)(y-1)
y-4=0 or y-1=0
y=4 or y=1
x^2=4 or x^2=1
x=+/-2 or x=+/-1
(x+2)(x-2)(x+1)(x-1)