Math Problem Statement

Biết rằng y = F(x) là một nguyên hàm của hàm số y = f(x). Đồ thị của hàm số y = f(x) được biểu diễn trong hình bên dưới. Biết rằng diện tích các phần hình phẳng A và B lần lượt là SA = 5, SB = 2. Khi F(-2) = 1 hãy tính giá trị F(1).

Solution

The image you've uploaded contains a mathematical problem involving integrals and areas. The problem describes a function y=F(x)y = F(x) which is the antiderivative of y=f(x)y = f(x). The graph shows two regions labeled AA and BB under the curve y=f(x)y = f(x), and the areas of these regions are given by:

SA=5,SB=2.S_A = 5, \quad S_B = 2.

Additionally, it mentions that F(2)=1F(-2) = 1, and the task is to find F(1)F(1).

To solve this, we can use the relationship between a function and its antiderivative. Since F(x)F(x) is the antiderivative of f(x)f(x), we know:

F(b)F(a)=abf(x)dxF(b) - F(a) = \int_a^b f(x) \, dx

Let’s break down the solution step by step:

  1. The area of region AA corresponds to the integral from x=2x = -2 to x=0x = 0, so:

SA=20f(x)dx=5S_A = \int_{-2}^0 f(x) \, dx = 5

  1. The area of region BB corresponds to the integral from x=0x = 0 to x=1x = 1, so:

SB=01f(x)dx=2S_B = \int_0^1 f(x) \, dx = 2

  1. From the properties of the antiderivative F(x)F(x), we can compute F(1)F(1) as:

F(1)F(2)=21f(x)dxF(1) - F(-2) = \int_{-2}^1 f(x) \, dx

This integral is the sum of the areas of regions AA and BB:

F(1)1=SA+SB=5+2=7F(1) - 1 = S_A + S_B = 5 + 2 = 7

So:

F(1)=1+7=8F(1) = 1 + 7 = 8

Thus, F(1)=8F(1) = 8.

Let me know if you'd like more details or further steps!

Here are some follow-up questions to deepen the understanding:

  1. How can the properties of definite integrals help in solving such problems?
  2. What is the difference between a function and its antiderivative in terms of graphical interpretation?
  3. How would the solution change if the area of region A were different, say SA=7S_A = 7?
  4. How does the Fundamental Theorem of Calculus apply here?
  5. Can the value of F(x)F(x) be determined at other points given the same information?

Tip: When calculating areas using definite integrals, always break the region into smaller parts for clarity and easier computation.

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Math Problem Analysis

Mathematical Concepts

Antiderivative
Definite Integrals
Area under a Curve

Formulas

F(b) - F(a) = ∫_a^b f(x) dx

Theorems

Fundamental Theorem of Calculus

Suitable Grade Level

Grades 11-12