i need help putting these into standard for and finding the vertex, focus and directrix. it would be greatly appreciated if you did it step by step. 1) x-2=y^2-10y 2)x^2+8x-y+20=0 thank you very much.
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Originally Posted by OnMyWayToBeAMathProffesor i need help putting these into standard for and finding the vertex, focus and directrix. it would be greatly appreciated if you did it step by step. 1) x-2=y^2-10y 2)x^2+8x-y+20=0 thank you very much. You're going to have to learn to "Complete the Square". I'll give you a hint. y^2-10y = (y^2 - 10y + 25) - 25 = (y-5)^2 - 25 You tell me where that 25 came from.
i know how to complete the square. you divided the middle term by 2 and the squared it. you then also added it on the other side. what is next? thanxs
Originally Posted by OnMyWayToBeAMathProffesor i need help putting these into standard for and finding the vertex, focus and directrix. it would be greatly appreciated if you did it step by step. 1) x-2=y^2-10y Originally Posted by TKHunny You're going to have to learn to "Complete the Square". I'll give you a hint. y^2-10y = (y^2 - 10y + 25) - 25 = (y-5)^2 - 25 You tell me where that 25 came from. Originally Posted by OnMyWayToBeAMathProffesor i know how to complete the square. you divided the middle term by 2 and the squared it. you then also added it on the other side. what is next? thanxs Put it in standard form. Either $\displaystyle x = a(y - h)^2 + k$ or $\displaystyle y = a(x - h)^2 + k$. -Dan
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