Question

please send me traditional method of this question
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Answer 1

Answer:

Option no.D ( 7 is the answer)

Step-by-step explanation:

4x³ + 8x² - x - 2 = 0

=> 4x²(x - 2) + 1(x - 2) = 0

=> (4x² + 1) (x -2) = 0

So, either (4x² + 1) or (x -2) will equal to 0. The value of x cannot be -ve so we consider here (x -2) = 0 => x = 2.

Now,

Putting the value of x = 2,

(2x + 3) = (2 × 2 + 3) = (4 + 3) = 7

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