document.write( "Question 530679: find the vertex of the parabola y = 4x2 - 16x - 11 \n" ); document.write( "

Algebra.Com's Answer #350195 by oberobic(2304) $\"\"$ $\"About$

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The axis of symmetry defines the x-coordinate of the vertex.
\n" ); document.write( "It is defined by -b/2a.
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\n" ); document.write( "-(-16)/(2*4) = 16/8 = 2
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\n" ); document.write( "Substitute x = 2 and find the y value for the vertex.
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\n" ); document.write( "y = 4(2^2) -16(2) -11
\n" ); document.write( "y = 4*4 -32 -11
\n" ); document.write( "y = 16 -43
\n" ); document.write( "y = -27
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\n" ); document.write( "Vertex is (2,-27).
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\n" ); document.write( " $\"+graph%28500%2C500%2C-5%2C10%2C-30%2C30%2C4%2Ax%5E2-16%2Ax-11%29+\"$ \n" ); document.write( "

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