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Question:

Let A(4, -4) and B(9, 6) be points on the parabola y² = 4x. Let C be a point chosen on the arc AOB of the parabola, where O is the origin, such that the area of ΔACB is maximum. Then, the area (in sq. units) of ΔACB is:

3012

3134

32

3114

Solution:

Area=5|t²-t|=5|(t-½)²-¼| Area is maximum when t=½ therefore Area=3114