The function f(x) = 7x + 9z-1 has one local minimum and one local maximum. This function has a local maximum at x = with value Preview 1) 1) 1) 1) Preview Preview and a local minimum at z = with value Get help: Video Box 1: Enter your answer as a number (like 5,-3, 2.2172) or as a calculation (like 5/3, 243, S Preview on Enter DNE for Does Not Exist, oo for Infinity Box 2: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 243, 5 Enter DNE for Does Not Exist, oo for Infinity Box 3: Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 243, 5 Enter DNE for Does Not Exist, oo for Infinity