1.

In how many points will the graph of x2 + 8x + 15 intersect X-axis ? Why ?

Answer»

We can write x2 + 8x + 15 as x2 + 5x + 3x + 15 

⇒ (x + 5) (x + 3) 

So its zero values are -5, -3

So the graph of x2 + 8x + 15 intersect x axis at two points only.



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