document.write( "Question 818307: find the vertex, axis of symmetry,domain,range,maximum or minimum, intervals over which f is increasing , and intervals over which f is decreasing .
\n" ); document.write( "f(x)=x^2+3x \n" ); document.write( "
Algebra.Com's Answer #492461 by TimothyLamb(4379)\"\" \"About 
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f(x) = x^2 + 3x
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\n" ); document.write( "the above quadratic equation is in standard form, with a=1, b=3, and c=0
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\n" ); document.write( "to solve the quadratic equation, by using the quadratic formula, plug this:
\n" ); document.write( "1 3 0
\n" ); document.write( "into this: https://sooeet.com/math/quadratic-equation-solver.php
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\n" ); document.write( "the two real roots (i.e. the two x-intercepts), of the quadratic are:
\n" ); document.write( "x = 0
\n" ); document.write( "x = -3
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\n" ); document.write( "the quadratic vertex is a minimum at: ( x= -1.5, f(x)= -2.25 )
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\n" ); document.write( "the axis of symmetry is: x = -1.5
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\n" ); document.write( "the interval over which f is increasing: x > -1.5
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\n" ); document.write( "the interval over which f is decreasing: x < -1.5
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\n" ); document.write( "Solve and graph linear equations:
\n" ); document.write( "https://sooeet.com/math/linear-equation-solver.php
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\n" ); document.write( "Solve quadratic equations, quadratic formula:
\n" ); document.write( "https://sooeet.com/math/quadratic-formula-solver.php
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\n" ); document.write( "Convert fractions, decimals, and percents:
\n" ); document.write( "https://sooeet.com/math/fraction-decimal-percent.php
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\n" ); document.write( "Calculate and graph the linear regression of any data set:
\n" ); document.write( "https://sooeet.com/math/linear-regression.php \n" ); document.write( "
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