document.write( "Question 47648: Give the equation of the function whose graph is describe.\r
\n" ); document.write( "\n" ); document.write( "The graph of y=x^2 is shifted 4 units to the right. this graph is then vertically stretched by a factor of 5 and reflected across the x-axis.Finally the graph is shifted 8 units upward.
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Algebra.Com's Answer #31473 by josmiceli(19441)\"\" \"About 
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start with \"y+=+x%5E2\"
\n" ); document.write( "\"+graph%28+200%2C+300%2C+-5%2C+5%2C+-4%2C+20%2C+x%5E2%29+\"
\n" ); document.write( "Shift 4 units to the right
\n" ); document.write( "\"y+=+%28x-4%29%5E2\"
\n" ); document.write( "\"+graph%28+200%2C+300%2C+-2%2C+10%2C+-4%2C+20%2C+%28x-4%29%5E2%29+\"
\n" ); document.write( "Stretch in the vertical direction by factor of 5
\n" ); document.write( "\"y+=+5%2A%28x-4%29%5E2\"
\n" ); document.write( "\"+graph%28+200%2C+300%2C+-2%2C+10%2C+-4%2C+20%2C+5%2A%28x-4%29%5E2%29+\"
\n" ); document.write( "Reflect about the x-axis
\n" ); document.write( "\"y+=+-5%2A%28x-4%29%5E2\"
\n" ); document.write( "\"+graph%28+200%2C+300%2C+-2%2C+10%2C+-20%2C+4%2C+-5%2A%28x-4%29%5E2%29+\"
\n" ); document.write( "Shift 8 units upward
\n" ); document.write( "\"y+-+8+=+-5%2A%28x-4%29%5E2\"
\n" ); document.write( "\"+graph%28+200%2C+300%2C+-2%2C+10%2C+-10%2C+20%2C+8-5%2A%28x-4%29%5E2%29+\"
\n" ); document.write( "Solving for y,
\n" ); document.write( "\"y+-+8+=+-5%2A%28x%5E2+-8x+%2B+16%29\"
\n" ); document.write( "\"y+=+-5%2A%28x%5E2+-8x+%2B16%29+%2B+8\"
\n" ); document.write( "\"y+=+-5%2Ax%5E2+%2B+40x+-+80+%2B+8\"
\n" ); document.write( "\"y+=+-5%2Ax%5E2+%2B+40x+-72\"
\n" ); document.write( "Check some values to see if they make sense
\n" ); document.write( "When x = 4,
\n" ); document.write( "\"y+=+-80+%2B+160+-72\"
\n" ); document.write( "\"y+=+%2B+8\"
\n" ); document.write( "OK
\n" ); document.write( "Find roots (solve for y=0) use \"x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"
\n" ); document.write( "where \"a%2Ax%5E2+%2B+b%2Ax+%2B+c+=+0\"
\n" ); document.write( "a = -5
\n" ); document.write( "b = 40
\n" ); document.write( "c = -72
\n" ); document.write( "\"x+=+%28-40+%2B-+sqrt%28+40%5E2-4%2A%28-5%29%2A%28-72%29+%29%29%2F%282%2A%28-5%29%29+\"
\n" ); document.write( "\"x+=+%28-40+%2B-+sqrt%281600+-+1440%29%29+%2F+-10\"
\n" ); document.write( "\"x+=+4+%2B-+sqrt%28160%29+%2F+-10\"
\n" ); document.write( "\"x+=+4+%2B-+4%2Asqrt%2810%29+%2F+10\"
\n" ); document.write( "\"x+=+4+%2B+1.265\"
\n" ); document.write( "\"x+=+4+-+1.265\"
\n" ); document.write( "These values make sense according to graph
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