Activity :2x2 + 13x + 15 = 0 a= (.....) , b = 13, c = 15 b 2 – 4ac = (13)2 - 4 x 2 x (…….) = 169 – 120 b 2 – 4ac = 49 = − ± √ 2 − 4 2 = −(… … ) ± √49 4 = −13 ± (… . ) 4 = 6 4 = −20 4 X = (….) or x = (….)
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a line through the centre O of a circle of radius 7 cm cuts the tangent , at a point P on the circle , at Q such that PQ = 24cm.Find OQ