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Which of the following pairs of graphs intersect? (i) ` y = x^(2) -x and y = 1` (ii) ` y = x^(2) - 2x + 3 and y = sin x ` (iii) ` y = x^(2) - x+1 and y = x-4` |
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Answer» (i) ` y = x^(2) - x and y = 1" intersect if "x^(2) - x = 1 or x^(2)-x-1 = 0`, which has real roots . Hence, the graphs intersect. (ii) ` y = x^(2) - 2x+3 and y = sin x` intersect if ` x^(2) - 2x+3 = sin x or (x-1)^(2) + 2=sin x`, which is not possible since L.H.S. has least value 2, while R.H.S. has maximum value 1. `(iii) y = x^(2)-x + 1 and y = x - 4" intersect if " x^(2) - x+1 = x-4 or x^(2) -2x + 5 = 0`, which has non-real roots. Hence, the graph do not intersect. |
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