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JEE Main
Exam
JEE Main
Subject
Mathematics
Chapter
Differentiation

JEE Main · Mathematics · Differentiation

Let f(x) = x^3 + vmatrix x^2 & x & 1 f'(1) & f''(2) & f'''(3) 1 & 1...

Let f(x)=x3+∣x2x1f′(1)f′′(2)f′′′(3)110∣, x∈Rf(x) = x^3 + \begin{vmatrix} x^2 & x & 1 \\ f'(1) & f''(2) & f'''(3) \\ 1 & 1 & 0 \end{vmatrix}, \ x \in \mathbb{R}. Then the value of f(10)f(10) is equal to

Correct answer

457

Step-by-step solution

Given f(x)=x3+∣x2x1f′(1)f′′(2)f′′′(3)110∣f(x) = x^3 + \begin{vmatrix} x^2 & x & 1 \\ f'(1) & f''(2) & f'''(3) \\ 1 & 1 & 0 \end{vmatrix}

Expanding the determinant along the first row, we get:
f(x)=x3+x2(0−f′′′(3))−x(0−f′′′(3))+1(f′(1)−f′′(2))f(x) = x^3 + x^2(0 - f'''(3)) - x(0 - f'''(3)) + 1(f'(1) - f''(2))
⇒f(x)=x3−f′′′(3)x2+f′′′(3)x+f′(1)−f′′(2)\Rightarrow f(x) = x^3 - f'''(3)x^2 + f'''(3)x + f'(1) - f''(2)

Differentiating with respect to xx successively:
f′(x)=3x2−2f′′′(3)x+f′′′(3)f'(x) = 3x^2 - 2f'''(3)x + f'''(3)
f′′(x)=6x−2f′′′(3)f''(x) = 6x - 2f'''(3)
f′′′(x)=6f'''(x) = 6

From this, we have f′′′(3)=6f'''(3) = 6.

Substitute f′′′(3)=6f'''(3) = 6 into the expression for f′′(x)f''(x):
f′′(x)=6x−12f''(x) = 6x - 12
At x=2x = 2, f′′(2)=12−12=0f''(2) = 12 - 12 = 0.

Substitute f′′′(3)=6f'''(3) = 6 into the expression for f′(x)f'(x):
f′(x)=3x2−12x+6f'(x) = 3x^2 - 12x + 6
At x=1x = 1, f′(1)=3(1)2−12(1)+6=−3f'(1) = 3(1)^2 - 12(1) + 6 = -3.

Now substitute the values of f′(1)f'(1), f′′(2)f''(2), and f′′′(3)f'''(3) back into the expression for f(x)f(x):
f(x)=x3−6x2+6x+(−3)−0f(x) = x^3 - 6x^2 + 6x + (-3) - 0
f(x)=x3−6x2+6x−3f(x) = x^3 - 6x^2 + 6x - 3

To find f(10)f(10):
f(10)=(10)3−6(10)2+6(10)−3f(10) = (10)^3 - 6(10)^2 + 6(10) - 3
f(10)=1000−600+60−3=457f(10) = 1000 - 600 + 60 - 3 = 457.

Answer: 457457
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