the area of a rectangle is 63 sq m . the width is two meters shorter than the length . what is the width ?
a = l x w w = l - 2 l = w + 2 a = ( w + 2 ) x w a = w ^ 2 + 2 x w 63 = w ^ 2 + 2 w 0 = w ^ 2 + 2 w - 63 0 = ( w + 9 ) ( w - 7 ) w = - 9 and w = 7 , width can not be negative so w = 7 answer is b
divide(subtract(sqrt(add(multiply(63, const_4), power(const_2, const_2))), const_2), const_2)