give the best answer
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Step-by-step explanation:
x=4
x^2-9x+k=0
=>(4)^2-9×4+k=0
=>16-36+k=0
=>k-20=0
=>k=20
x^2-9x+20=0
=>x^2-4x-5x+20=0
=>x(x-4)-5(x-4)=0
=>(x-4)(x-5)=0
=>x=4, 5
Hence, other root is 5.
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