Give the coordinates of \( Q \) under a dilation about point \( D \) with scale factor 4 . \( Q(9,-3) \) \( D(4,-4) \) Show your work here
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To find the coordinates of \( Q' \) under a dilation about point \( D \) with a scale factor of 4, we use the formula: \[ Q' = D + k(Q - D) \] where \( k \) is the scale factor, \( Q \) is the original point, and \( D \) is the center of dilation. 1. Calculate \( Q - D \): \[ Q - D = (9, -3) - (4, -4) = (9 - 4, -3 + 4) = (5, 1) \] 2. Multiply \( Q - D \) by the scale factor \( k = 4 \): \[ k(Q - D) = 4 \cdot (5, 1) = (20, 4) \] 3. Add \( D \) to \( k(Q - D) \): \[ Q' = D + k(Q - D) = (4, -4) + (20, 4) = (4 + 20, -4 + 4) = (24, 0) \] Thus, the coordinates of \( Q' \) under the dilation are \( (24, 0) \).