document.write( "Question 31796: Can someone help? and check my answer to see if im doing this right?
\n" );
document.write( "For the function y = x^2 - 4x - 5, perform the following tasks:
\n" );
document.write( "(1)Put the function in the form y = a(x - h)^2 + k.
\n" );
document.write( "I got the answer: y = (x-2)^2 - 9\r
\n" );
document.write( "\n" );
document.write( "What is the line of symmetry?\r
\n" );
document.write( "\n" );
document.write( "I got the answer: x = 2\r
\n" );
document.write( "\n" );
document.write( "Graph the function using the equation in part (1). Explain why it is not necessary to plot points to graph when using y = a (x – h)^2 + k.\r
\n" );
document.write( "\n" );
document.write( "how does this graph compare to the graph of y = x^2? \n" );
document.write( "
Algebra.Com's Answer #20713 by venugopalramana(3286)![]() ![]() You can put this solution on YOUR website! SEE MY COMMENTS BELOW..AND THE ADDDITIONAL EXAMPLE GIVEN BELOW \n" ); document.write( "Can someone help? and check my answer to see if im doing this right? \n" ); document.write( "For the function y = x^2 - 4x - 5, perform the following tasks: \n" ); document.write( "(1)Put the function in the form y = a(x - h)^2 + k. \n" ); document.write( "I got the answer: y = (x-2)^2 - 9......................OK \n" ); document.write( "What is the line of symmetry? \n" ); document.write( "I got the answer: x = 2...OK..VERY GOOD \n" ); document.write( "Graph the function using the equation in part (1). \n" ); document.write( " \n" ); document.write( " Explain why it is not necessary to plot points to graph when using y = a (x – h)^2 + k. \n" ); document.write( " YOU CAN DRAW LINE OF SYMMETRY.,PLOT VERTEX AND SKETCH THE GRAPH ON EITHER SIDE OF LINE OF SYMMETRY BY SMOOTH LINES NOTING,THE X INTERCEPTS OF -1 AND 5 AND THAT Y TENDS TO INFINITY AS X TENDS TO INFINITY. \n" ); document.write( "how does this graph compare to the graph of y = x^2? \n" ); document.write( " \n" ); document.write( "\n" ); document.write( "--------------------------------------------------------------------------- \n" ); document.write( "SEE THE FOLLOWING EXAMPLE WHICH IS ALMOST SAME AS YOUR PROBLEM AND TRY.IF STILL IN DIFFICULTY PLEASE COME BACK. \n" ); document.write( "Y=X^2-2X-3=X^2-2*X*1+1^2-1-3=(X-1)^2-1-3=(X-1)^2-4=0 \n" ); document.write( "X INTERCEPT IS OBTAINED BY PUTTING Y=0....WE GET \n" ); document.write( "X^2-2X-3=0=X^2-3X+X-3=X(X-3)+1(X-3)=(X-3)(X+1)=0...SO..X=3 OR -1... \n" ); document.write( "Y INTERCEPT IS GOT BY PUTTING X =0...WE GET \n" ); document.write( "Y=0-0-3=-3 \n" ); document.write( "SEE THE GRAPH BELOW ...... \n" ); document.write( "graph( 500, 500, -10, 20, -20, 20,x^2-2x-3 ) \n" ); document.write( "THE AXIS IS X=1 AS YOU CAN SEE FROM THE GRAPH \n" ); document.write( "ONE POINT SYMMETRIC TO Y INTERCEPT??NO...SYMMETRIC TO AXIS IT IS......(-1,3) \n" ); document.write( "****************************************************************************** \n" ); document.write( "I have to put this equation y=x^2-2x-15 into this form y=a(x-h)^2+k. \n" ); document.write( "MAKE A PERFECT SQUARE USING X^2 AND X TERMS.ADD AND SUBTRACT THE REQUIRED CONSTANT FOR THE PURPOSE. \n" ); document.write( "Y=(X-1)^2-1-15=(X-1)^2-16...COMPARING WITH THE ABOVE \n" ); document.write( "y=a(x-h)^2+k. \n" ); document.write( "WE GET A=1 AND K=-16 \n" ); document.write( "I have to find the line of symmetry. \n" ); document.write( "X-1=0 IS THE LINE OF SYMMETRY SINCE ON EITHER SIDE OF X=1,WE GET SYMMETRIC/SAME VALUES FOR Y..AT X=1+2=3..Y IS -12 AND AT X=1-2=-1 ALSO WE GET Y=-12 \n" ); document.write( "(h,k)=vertex I think you use complete the square technique. \n" ); document.write( "YA ..THE VERTEX AS YOU SHOULD KNOW NOW IS AT X=1 AND AT X=1 ,Y=-16 .SO (1,-16) IS THE VERTEX \n" ); document.write( "THE GRAPH WILL LOOK LIKE THIS \n" ); document.write( "graph( 500, 500, -10, 20, -20, 20, x^2-2x-15 ) \n" ); document.write( "Please help. thanks \n" ); document.write( " |