If the slope of parabola 𝑦=𝐴𝑥2+𝐵𝑥+𝐶y=Ax 2 +Bx+C, where 𝐴,𝐵,𝐶∈𝑅A,B,C∈R at points (3, 2) and (2, 3) are 16 and 12 respectively.Calculate the value of 𝐴A.
Question
If the slope of parabola 𝑦=𝐴𝑥²+𝐵𝑥+𝐶, where 𝐴,𝐵,𝐶∈𝑅 at points (3, 2) and (2, 3) are 16 and 12 respectively. Calculate the value of 𝐴.
Solution
The slope of a parabola y = Ax^2 + Bx + C at a point (x, y) is given by the derivative of the function, which is 2Ax + B.
Given that the slopes at points (3, 2) and (2, 3) are 16 and 12 respectively, we can set up the following equations:
2A3 + B = 16 2A2 + B = 12
This is a system of linear equations. We can solve it by subtracting the second equation from the first to eliminate B:
2A3 - 2A2 = 16 - 12 2A = 4 A = 4/2 = 2
So, the value of A is 2.
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