Page 9 - Digi Notes - MATHS - 18.03.2016

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2
2
I. 20x - x - 12 = 0 II. 20y + 27y + 9 = 0

2
I. 20x –x – 12 = 0
2
20x + 15x–16x–12 = 0
5x [4x+3] –4 [4x+3] = 0
[4x+3] [5x–4] = 0
–
x = ,

2
II. 20y + 27y + 9 = 0
2
20y +15y + 12y + 9 = 0
5y (4y+3) + 3(4y+3) = 0
– –
y = ,

xy

2
2
I. x – 9x + 20 = 0 II. y – 13y + 42 = 0

2
I. x – 9x + 20 = 0
2
x – 5x –4x + 20 = 0
x(x–5) –4 (x–5)=0 (x–4) (x–5) = 0
x = 4,5
2
II. y –13y + 42 = 0
2
y – 7y – 6y +42 =0
y(y–7)–6(y–7) = 0
(y–6) (y–7) = 0
y =6, y = 7

x
⁄
⁄
I. √ + √ = II. () + () =

I. 35x = -70 x = -2

II. 3y + 7 = 0 y = −

x > y

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