write the natuif x=4 is aa root of x2 - 9x + k = 0, find the value of k and hence find the other root
hirvikapasi16:
can i add some other method to find the other root
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Answer:
X = 4
POLYNOMIAL ==> X²-9X+K = 0
PUTTING VALUE OF X IN POLYNOMIAL
==> (4)²-9(4)+K = 0
==> 16-36+K = 0
==> -20 + K = 0
==> K = 20
SO, THE
POLYNOMIAL WILL BE :- X²-9X+20
==> X²-9X+20
A = 1 , B = -9 , C= 20
A = -b±√4ac/ 2a
==> -(-9) ± √4(1)20 / 2(1)
==> 9 ± √80 / 2
==> 9 ± √2*2*2*2*5 /2
==> 9 ± 4√5 / 2
==> 9+4√5/2 ; 9-4√5/2
i hv another method n to find its other root i tried this method. Not sure if its correct but i think it may help u.
ok
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