Question
Which of the following element is used for the
manufacture of the safety-matches?Solution
The element phosphorus is used to produce safety matches. During manufacture, the match stick is soaked in ammonium phosphate, which prevents ‘afterglow’ once the flame has gone out, and paraffin, which ensures that it burns easily.
I). p2 - 20p + 51 = 0,
II). 2q2 - 7q + 6 = 0
I. 2x2 - 9 x + 9 = 0Â
II. 2y2 - 7 y + 3 = 0
I. x2 – 19x + 88 = 0
II. (y + 4)2 = 121
If α, β are the roots of the equation x² – px + q = 0, then the value of α2+β2+2αβ isÂ
...I. 104x² + 9x - 35 = 0
II. 72y² - 85y + 25 = 0
I. 6 y² + 11 y – 7= 0
II. 21 x² + 5 x – 6 = 0
Equation 1: x² - 220x + 12100 = 0
Equation 2: y² - 210y + 11025 = 0
I. 6x2 - 47x + 77 =0
II. 6y2 - 35y + 49 = 0
I. y² - 7 y – 18 = 0
II. x² + 10 x + 16 = 0
I. 10x² - 11x + 3 = 0
II. 42y² - 23y – 10 = 0
