need solution ......... for question 5
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Solution;
For equal roots "D" must be zero.
D= b^2 - 4ac
=>(k+1)^2 - 4*2*8 = 0
=> k^2+ 1 +2k - 64 = 0
=> k^2+2k = 63
=>k^2 + 2k - 63 =0
=> k^2 +9k - 7k - 63 = 0
=> k(k+9) -7 (k+ 9) = 0
=> (k - 7) (k+ 9) = 0
=> k - 7= 0 Or k + 9 = 0
=> K= 7 Or k = -9
For equal roots "D" must be zero.
D= b^2 - 4ac
=>(k+1)^2 - 4*2*8 = 0
=> k^2+ 1 +2k - 64 = 0
=> k^2+2k = 63
=>k^2 + 2k - 63 =0
=> k^2 +9k - 7k - 63 = 0
=> k(k+9) -7 (k+ 9) = 0
=> (k - 7) (k+ 9) = 0
=> k - 7= 0 Or k + 9 = 0
=> K= 7 Or k = -9
yogitatyagi1:
thanks
option is not their ...
may be
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