For any quadratic polynomial f(x), it is true that fx=fa+f'a(x-a)+f"a2!x-a2 where a is any real number. If 3x2+4x+7(x-2)3=A(x-2)3+B(x-2)2+C(x-2) and g(x)=3x2+4x+7 then A+B+C=

TS EAMCET · Maths · Differentiation

For any quadratic polynomial $f (x),$ it is true that
$f (x) = f (a) + f' (a) (x - a) + \frac{f " (a)}{2!} {(x - a)}^{2}$ where $a$ is any real number.
If $\frac{3 x^{2} + 4 x + 7}{(x - 2)^{3}} = \frac{A}{(x - 2)^{3}} + \frac{B}{(x - 2)^{2}} + \frac{C}{(x - 2)}$ and $g (x) = 3 x^{2} + 4 x + 7$ then $A + B + C =$

A $g (2) + g' (2) + g " (2)$
B $g " (2) + 2 g (2) + \frac{g' (1)}{2!}$
C $g (2) + g' (2) + \frac{g " (2)}{2!}$
D $2 g (2) + 2 g' (2) + \frac{g " (2)}{2!}$

Verified Solution

Answer & Solution

Correct Answer

(C) $g (2) + g' (2) + \frac{g " (2)}{2!}$

Step-by-step Solution

Detailed explanation

3x2+4x+7(x-2)3=A(x-2)3+B(x-2)2+C(x-2) is the given equation, which can be written as, 3x2+4x+7=A+B(x-2)+C(x-2)2 3x2+4x+7=A+B(x-2)+C(x2-4x+4) Comparing the coefficients we get,…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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For any quadratic polynomial f(x), it is true thatfx=fa+f'a(x-a)+f"a2!x-a2 where a is any real number.If 3x2+4x+7(x-2)3=A(x-2)3+B(x-2)2+C(x-2) and g(x)=3x2+4x+7 then A+B+C=

Step-by-step Solution