Math Problem Statement

Cho đường thẳng (d): y = -3x - m + 2 (m là tham số) và Parabol (P): y = x^2. Trong mỗi ý a), b), c), d) thì sinh chọn đúng (Đ) hoặc sai (S).

Solution

It appears you've uploaded an image containing a set of math questions related to the intersection of a line and a parabola. I will analyze the image and provide detailed insights.

Let me first break down the question:

  • The given line equation is y=3xm+2y = -3x - m + 2 and the parabola equation is y=x2y = x^2.
  • The problem asks about different scenarios where the line and parabola intersect.

I'll provide solutions for the given sub-questions, starting with:

a) m>174m > \frac{17}{4}, and the question asks if the line intersects the parabola at two distinct points.

To determine the intersection points between the line and parabola, we need to set the equations equal to each other:

3xm+2=x2-3x - m + 2 = x^2

Rearrange the equation:

x2+3x+(m2)=0x^2 + 3x + (m - 2) = 0

Now, we apply the discriminant from the quadratic formula to check how many real solutions there are (which corresponds to the number of intersection points). The discriminant Δ\Delta is given by:

Δ=b24ac\Delta = b^2 - 4ac

For our equation x2+3x+(m2)=0x^2 + 3x + (m - 2) = 0, we have a=1a = 1, b=3b = 3, and c=m2c = m - 2. Thus, the discriminant is:

Δ=324(1)(m2)=94(m2)=94m+8=174m\Delta = 3^2 - 4(1)(m - 2) = 9 - 4(m - 2) = 9 - 4m + 8 = 17 - 4m

For the line and the parabola to intersect at two distinct points, the discriminant must be positive:

174m>017 - 4m > 0

Solving for mm:

4m<17m<1744m < 17 \quad \Rightarrow \quad m < \frac{17}{4}

Therefore, if m>174m > \frac{17}{4}, the discriminant becomes negative, meaning no real solutions exist. So, the line will not intersect the parabola at two distinct points.

Thus, the answer to part (a) is "Sai" (False).


Let me know if you want detailed steps for the other sub-questions (b), (c), or (d) as well!

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Discriminant Analysis
Intersection of Functions

Formulas

Quadratic equation: ax^2 + bx + c = 0
Discriminant formula: Δ = b^2 - 4ac
Quadratic roots: x = (-b ± √Δ) / 2a

Theorems

Quadratic Formula
Discriminant Theorem

Suitable Grade Level

Grades 10-12