document.write( "Question 765888: interval does increase y=x^2+4x \n" ); document.write( "
Algebra.Com's Answer #466601 by tommyt3rd(5050)![]() ![]() You can put this solution on YOUR website! vertex is on the y-axis, opens upwards, so it must increase when x>0, i.e. \n" ); document.write( "(0,oo)\r \n" ); document.write( "\n" ); document.write( ":) \n" ); document.write( " |