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What transformation would occur to the parent function, y = √x, to arrive at the new equation, y - 2 = 2√(x + 3)?

a) Shift 3 units left and 2 units down
b) Shift 3 units right and 2 units down
c) Shift 2 units up and 3 units left
d) Shift 2 units down and 3 units right

1 Answer

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Final answer:

The correct transformation from the parent function y = √x to the new equation y - 2 = 2√(x + 3) is a shift of 3 units left and 2 units up, which is achieved by the inside addition, causing a horizontal shift, and the outside addition indicating a vertical shift.

Step-by-step explanation:

To determine the transformation that occurs to the function y = √x to arrive at the new equation y - 2 = 2√(x + 3), let's rewrite the new function to more easily compare it to the parent function.

Adding 2 to both sides of the new equation gives us y = 2√(x + 3) + 2. Now, we compare this to the parent function y = √x.

The √(x + 3) indicates a horizontal shift, and because it is (x + 3), the shift is 3 units to the left of the coordinate system (since adding inside the function moves in the opposite direction). The multiplication of the square root part by 2 indicates that there is vertical stretching by a factor of 2, but this doesn't involve a shift in position, so we won't focus on it. The +2 at the end of the equation indicates a vertical shift upwards by 2 units in the coordinate system.

Therefore, the correct transformation is a shift of 3 units left and 2 units up, which corresponds to option (c): Shift 2 units up and 3 units left.

User Andrew Magill
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