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Question

Question: If AB makes 90<sup>0</sup> angle at the vertex of parabola then-...

If AB makes 900 angle at the vertex of parabola then-

A

t1t2 = – 1

B

t1t2 = – 4

C

t1 = 2t2\frac{2}{t_{2}}

D

t2 = – 2t1\frac{2}{t_{1}}

Answer

t1t2 = – 4

Explanation

Solution

q = 900 \slope of OA) (slope of OB) = – 1

2at1 – 0/at12 – 0 × 2at2 – 0/at22 – 0 = – 1

2/t1 × 2/t2 = – 1

\ t1t2 = – 4