if -1 is a zero of the polynomial f(x)=x^2-7x-8 then calculate the zeros
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divide x2-7x-8 by (x+1)
we get
_x-8______
x+1 ] x2-7x-8
x2+x__
-8x-8
-8x-8
00
.'.( x-8 ) and (x+1)
zeroes are x=8,-1
we get
_x-8______
x+1 ] x2-7x-8
x2+x__
-8x-8
-8x-8
00
.'.( x-8 ) and (x+1)
zeroes are x=8,-1
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