if alpha and beta are the zeros of
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f(x)=4x²-5x-1
=4x²+2x+2x-1
=2x(2x+1)-1(2x+1)
=(2x+1)(2x+1)
2x+1=0
2x=-1
x=-1\2
2x-1=0
2x=1
x=1\2
alpha =-1\2
beta=1\2
(1)=alpha-beta
=-1\2-1\2
=-1
(2)=(-1\2)²+(1\2)²
=1\4+1\4
=1+1\4=2\4=1\2
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