Christensen O'Quinn
07/15/2024 · Junior High School
Find \( f \) such that \( f^{\prime}(x)=4 x^{2}+3 x-3 \) and \( f(0)=7 \) \( f(x)=\square \)
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Tutor-Verified Answer
Step-by-step Solution
To find the function \( f(x) \) such that \( f'(x) = 4x^2 + 3x - 3 \) and \( f(0) = 7 \), we need to integrate the derivative \( f'(x) \).
1. **Integrate \( f'(x) \)**:
\[
f(x) = \int (4x^2 + 3x - 3) \, dx
\]
We can integrate each term separately:
- The integral of \( 4x^2 \) is \( \frac{4}{3}x^3 \).
- The integral of \( 3x \) is \( \frac{3}{2}x^2 \).
- The integral of \( -3 \) is \( -3x \).
Therefore, we have:
\[
f(x) = \frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + C
\]
where \( C \) is the constant of integration.
2. **Use the initial condition \( f(0) = 7 \)**:
Substitute \( x = 0 \) into the equation:
\[
f(0) = \frac{4}{3}(0)^3 + \frac{3}{2}(0)^2 - 3(0) + C = C
\]
Since \( f(0) = 7 \), we have:
\[
C = 7
\]
3. **Write the final expression for \( f(x) \)**:
Substitute \( C \) back into the equation for \( f(x) \):
\[
f(x) = \frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + 7
\]
Thus, the function \( f(x) \) is:
\[
\boxed{\frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + 7}
\]
Quick Answer
\[
f(x) = \frac{4}{3}x^3 + \frac{3}{2}x^2 - 3x + 7
\]
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