document.write( "Question 1198827: If f(1) = 7 and f(n) = f(n - 1) + 2 then find the value of f(4). \n" ); document.write( "

Algebra.Com's Answer #832482 by ikleyn(52781) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "\r\n" );
document.write( "First calculate f(2), using the given formula.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Next calculate f(3).\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Finally, calculate f(4).\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Alternatively, you may notice that the formula defines arithmetic progression \r\n" );
document.write( "with the 1st term  a(1) = 7 and the common difference  d = 2.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Then a(4) = a(1) + (4-1)*2,\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "and you can compute it mentally.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );