Question
Naphthalene balls, commonly used as a pest repellent,
are derived from which source?Solution
Naphthalene balls are made from coal tar and are used as insecticides and pest repellents, especially against moths and cockroaches. The chemical formula of naphthalene is C₁₀H₈.
I. 2x2 – 5x – 63 = 0
II. 2y2 – 7y – 72 = 0
If x2 - 3x - 18 = 0 and y2 + 9y + 18 = 0, which of the following is true?
Solve the given two equations and answer the two questions that follow as per the instructions given below.
I. (1/4) + 7.5p(-2) = 3.62...
I. 2x2 + 3x - 9 = 0
II. 3y2 - y - 10 = 0
I. x2 + x – 42 = 0
II. y2 + 6y – 27 = 0
Solve the quadratic equations and determine the relation between x and y:
Equation 1: x² - 20x + 96 = 0
Equation 2: y² - 18y + 72 = 0
I. x2 – 12x + 32 = 0
II. y2 + y - 20 = 0
l. x2 - 16x + 64 = 0
II. y2 = 64
I. x2 - 5x - 14 = 0
II. y2 - 16y + 64 = 0
I. 10x² - 11x + 3 = 0
II. 42y² - 23y – 10 = 0