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Scale factor after dilation

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find the scale factor after a dilation centered at the origin if H(4*square root of 2, -3 square root of 5), P (-2 * square root of 2, 2 * square root of 5) and H(square root of 128, - square root of 180) P(- square root of 32, square root of 80)

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On a coordinate plane, the dilation defined by the rule D(x,y)=(kx,ky) has scale factor k and its center is at the origin.

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On a coordinate plane, the dilation defined by the rule D(x,y)=(kx,ky) has scale factor k and its center is at the origin.

Since in the question the center is also at the origin, in this question, ...

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