The parabola, x2 = 8y is shifted to the right by 1 unit and shifted downward by 7units. Find an equation for the shifted parabola and find the new vertex, focus, anddirectrix
Question
The parabola, x2 = 8y is shifted to the right by 1 unit and shifted downward by 7units. Find an equation for the shifted parabola and find the new vertex, focus, anddirectrix
Solution
The original equation of the parabola is x² = 8y.
Step 1: Shift the parabola to the right by 1 unit When a graph is shifted to the right by 1 unit, we replace x with (x-1) in the equation. So, the new equation becomes (x-1)² = 8y.
Step 2: Shift the parabola downward by 7 units When a graph is shifted downward by 7 units, we replace y with (y+7) in the equation. So, the new equation becomes (x-1)² = 8(y+7).
So, the equation of the shifted parabola is (x-1)² = 8(y+7).
The vertex of the original parabola is at (0,0). After shifting the parabola to the right by 1 unit and downward by 7 units, the new vertex is at (1,-7).
The focus of the original parabola is at (0,2). After shifting the parabola to the right by 1 unit and downward by 7 units, the new focus is at (1,-5).
The directrix of the original parabola is y = -2. After shifting the parabola downward by 7 units, the new directrix is y = -9.
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