8. Check whether -3 and 3 are the zeroes of the polynomial x2- 9.
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x²-9 =0
putting 3 in x place
3²-9=0
9-9=0
yes 3 is a zero.....
putting -3 in x place
(-3)²-9=0
9-9=0
yes -3 is also a zero of this polynomial
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