(x - 1)2 + (y - 2)2 = (x – 1) (y - 2), x மற்றும் y ஆகியவை முழு எண்களாக இருந்தால், 2x + 3y இன் மதிப்பு என்ன ?

This question was previously asked in
RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 1)
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  1. 5
  2. 8
  3. 11
  4. 7

Answer (Detailed Solution Below)

Option 2 : 8
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கொடுக்கப்பட்ட,

(x - 1)2 + (y - 2)2 = (x – 1) (y - 2)

கருத்து:/சூத்திரம்:

(x – y)2 = k2

(x – y) = k அல்லது (–k)

x = (k + y) அல்லது (y - k)

கணக்கீடு:

(x -1)2 + (y - 2)2 = (x – 1) (y - 2)

 

⇒ (x – 1) 2 = (x – 1) (y – 2) என எடுத்துக்கொள்வதால் 

⇒ (x – 1) = (y – 2)

⇒ x – y = -2 + 1

⇒ x – y = (-1) ----(1)

 

⇒ (y – 2) 2 = (x – 1) (y – 2) என எடுத்துக்கொள்வதால் 

⇒ (y – 2) = (x – 1)

⇒ x – y = -2 + 1

⇒ x – y = (-1) ----(2)

y = 2 மற்றும் x = 1, பின்னர்

⇒ 1 - 2 = (-1)

(-1) = (-1) (நிறைவடைகிறது)

இப்போது,

2x + 3y

⇒ 2 × 1 + 3 × 2

⇒ 2 + 6

⇒ 8

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