Sum of the roots of the equation

4x - 3(2x + 3) + 128 = 0 is

This question was previously asked in
NIMCET 2016 Official Paper
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  1. 5
  2. 6
  3. 7
  4. 8

Answer (Detailed Solution Below)

Option 3 : 7
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NIMCET 2020 Official Paper
120 Qs. 480 Marks 120 Mins

Detailed Solution

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Concept:

Base Rule

If b raised to the xth power is equal to b raised to the yth power, that implies that x = y.” 

 ⇒ x = y

Calculations:

Given equation is 4x - 3(2x + 3) + 128 = 0

⇒ 

⇒ 

⇒ 

⇒ 

⇒ 

⇒ 

⇒ x = 4 or x = 3

The roots of the equation 4x - 3(2x + 3) + 128 = 0 are 4 and 3

Its Sum = 4 + 3 = 7

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