if you want to mark as brainlist solve this
with explanation
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The swimming pool has 12
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x^2+kx+1
so-3 must satisfy the equation (k-1)x^2+kx+1=0
=(k-1)(-3)^2+k(-3)+1=0
=9(k-1)-3k+1=0
=9k-9-3k+1=0
=6k=8
=k=4/3
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