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Indefinite Integrals · Question 5 of 90

Question 5

EasyOriginal question

If F′(x)=4x3−6xF'(x) = 4x^3 - 6x and F(2)=3F(2) = 3, what is F(x)F(x)?

Options for question 5

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. F(x)=∫(4x3−6x) dx=x4−3x2+CF(x) = \int (4x^3 - 6x)\,dx = x^4 - 3x^2 + C.

  2. F(2)=16−12+C=3F(2) = 16 - 12 + C = 3, so C=−1C = -1.

Worth noting

+3+3 copies F(2)F(2) into the constant without working out x4−3x2x^4 - 3x^2 at x=2x = 2.

Concept
Fixing the constant of integration
Typical time
60 s
Your time
—
The rule this testsIntegration as the reverse of differentiation
Practise this chapter →

Ten questions from Indefinite Integrals, at your own pace.

Practise this chapter →

Ten questions from Indefinite Integrals, at your own pace.