1(ii)
If x2 + kx + 6 = (x - 2)(x - 3) for all values of x, then the value of k is :
- (a)-5
- (b)-3
- (c)-2
- (d)5
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Given,
⇒ x2 + kx + 6 = (x - 2)(x - 3)
⇒ x2 + kx + 6 = x2 - 3x - 2x + 6
⇒ x2 + kx + 6 = x2 - 5x + 6
⇒ x2 - x2 + kx + 6 - 6 = -5x
⇒ kx = -5x
⇒ k = -5.
Hence, Option 1 is the correct option.