For what value of 'k' '3' is a root of the equation 2х²+х+k=0.
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#AlexaRousey here!!
If 3 is root of 2x^2 +x + k, then
2(3)^2 +3 + k = 0
=) 2(9) + 3 + k = 0
=) 21 + k = 0
=) k = - 21
Thanks!
If 3 is root of 2x^2 +x + k, then
2(3)^2 +3 + k = 0
=) 2(9) + 3 + k = 0
=) 21 + k = 0
=) k = - 21
Thanks!
shubhibhatnagar:
Plz..tell me it is a rigt answetr
Answered by
0
substitute k=3 in equation
2(3)^2+3+k=0
2(9)+3+k=0
18+3+k=0
21+k=0
k=-21 is answer
2(3)^2+3+k=0
2(9)+3+k=0
18+3+k=0
21+k=0
k=-21 is answer
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