document.write( "Question 137167: How do you graph a quadratic functions for Example f(x)=x squared+4x-7? \n" ); document.write( "

Algebra.Com's Answer #100355 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
you graph a quadratic functions for Example f(x)=x squared+4x-7
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\n" ); document.write( "Fastest Way:
\n" ); document.write( "Find the vertex which occurs when x = -b/2a = -4/(2*1) = -2
\n" ); document.write( "Find f(-2) = (-2)^2+4*-2-7 = -11
\n" ); document.write( "Vertex: (-2,-11)
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\n" ); document.write( "Find a few points on each side of x=-2:
\n" ); document.write( "If x = -3, y = (-3)^2+4*-3-7 = -10'
\n" ); document.write( "If x = -1, y = -10
\n" ); document.write( "If x = -4, y = (-4)^2+4*-4-7= -7
\n" ); document.write( "If x = 0 , y = -7
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\n" ); document.write( "Plot those points; draw a smooth curve thru them to the left and to the right.
\n" ); document.write( "That is the graph.
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\n" ); document.write( " $\"graph%28400%2C300%2C-10%2C10%2C-15%2C10%2Cx%5E2%2B4x-7%29\"$
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

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