document.write( "Question 890199: 1. If f(x)=x^2+2, find f^-1(3)
\n" ); document.write( "A. +-1
\n" ); document.write( "B. +-sqrt3
\n" ); document.write( "C. 11
\n" ); document.write( "D. 3\r
\n" ); document.write( "\n" ); document.write( "2. Identify the inverse of the function f(x)=-7x+2
\n" ); document.write( "A. 1/(7x-2)
\n" ); document.write( "B. (2-x)/7
\n" ); document.write( "C. (X-2)/7
\n" ); document.write( "D. 1/(2-7x)\r
\n" ); document.write( "\n" ); document.write( "I don't know how to do these. Please help! \n" ); document.write( "
Algebra.Com's Answer #538794 by rothauserc(4718)\"\" \"About 
You can put this solution on YOUR website!
Generally to find the inverse of a function you solve for x and then replace x with y and y with x. So, here we go,
\n" ); document.write( "1. y = x^2+2
\n" ); document.write( "x^2 = y -2
\n" ); document.write( "x = square root (y-2)
\n" ); document.write( "f^-1(x) = square root (x-2)
\n" ); document.write( "f^-1(3) = square root (3-2)
\n" ); document.write( "f^-1(3) = + or - 1
\n" ); document.write( "answer is A
\n" ); document.write( "2. Identify the inverse of the function f(x)=-7x+2
\n" ); document.write( "y = -7x +2
\n" ); document.write( "7x = (2-y)
\n" ); document.write( "x = (2-y) / 7
\n" ); document.write( "f^-1(x) = (2-x) / 7
\n" ); document.write( "answer is B
\n" ); document.write( " \n" ); document.write( "
\n" );