Given the function f(x)=x 2 +2x+1, find: a) f(−7) Start with f(x) = x 2 + 2x + 1 1. Take out all the x's, and replace them with open parentheses f( )= ( ) 2 + 2( ) + 1 2. Put -7's in the parentheses: f(-7)= (-7) 2 + 2(-7) + 1 Leave the left side as it is and simplify the right side: f(-7)= 49 - 14 + 1 f(-7)= 36 -----
