document.write( "Question 1069126: Help me solve by completing the square to change the form of the function\r
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document.write( "f(x) = -2x^2-2x+2\r
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document.write( "State the Vertex\r
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document.write( "State the Point on the line (x,y) \n" );
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Algebra.Com's Answer #684359 by Boreal(15235) You can put this solution on YOUR website! f(x) = -2x^2-2x+2 =-(2x^2+2x-2) \n" ); document.write( "set equal to 0 and move the constant over. We are moving +2 over, so it will be negative on the other side \n" ); document.write( "-(2x^2+2x)=-2 \n" ); document.write( "divide by 2 (could do earlier) to make the leading coefficient 1) \n" ); document.write( "-(x^2+x)= -1 \n" ); document.write( "take half of the coefficient first power term and square it, adding it to both sides. \n" ); document.write( "-(x^2+x+(1/4))=-1-1/4 \n" ); document.write( "make the leading signs positive (can do this earlier \n" ); document.write( "(x^2+x+1/4)=(5/4) \n" ); document.write( "factor \n" ); document.write( "(x+(1/2))^2=5/4 \n" ); document.write( "take the square roots of both sides \n" ); document.write( "x+(1/2)=+/- sqrt (5)/2 \n" ); document.write( "bring the 1/2 over \n" ); document.write( "x=-1/2+/- sqrt (5)/2 or (-1+/- sqrt (5)/2 \n" ); document.write( "The vertex x-value is -b/2a, where b=-2 and a=-2. The vertex x is - (-2/-4)=-1/2 \n" ); document.write( "If x= -1/2, f(x)=-2(1/4)+2(1/2)+2=(5/2) \n" ); document.write( "the vertex is at (-1/2, 5/2) \n" ); document.write( "a point on the function is (0,2). Set x equal to 0 for the easiest point to find. \n" ); document.write( " |