My Math Forum Matrix Problem I am stumped on

 Pre-Calculus Pre-Calculus Math Forum

 January 25th, 2015, 05:14 PM #1 Newbie   Joined: Jan 2015 From: usa Posts: 1 Thanks: 0 Matrix Problem I am stumped on Find the transformation for the triangle with the given vertices: D(8,15) E(7,-4) F(4,-10) moved right 3 and down 1, then reflected about the x-axis, then rotated 172 degrees counter clockwise. I know the answer, but I don't have any idea how to get it. Answer is D1 = (-8.4, 15.4) E1 = (-10.6, -3.6) F1 = (-8.5, -9.9) Thanks!
 January 25th, 2015, 06:38 PM #2 Member   Joined: Jan 2015 From: Orlando, Florida Posts: 92 Thanks: 10 first part is easy, add the x and y coordinates of each vertex by 3 and -1 respectively. now change the sign of the y coordinate of each vertex. finally, multiply each of the vertex (as a vector) by the rotational matrix arccos 172 -arcsin 172 arcsin 172 arccos172

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