![]() This is positive, so we mark this region of the diagram with a positive sign. We substitute □ = 4 in to get a result of 4. This is a negative output and so, we write a negative sign on the sign diagram.įinally, we substitute a number that is larger than 3 into f(□). We substitute □ = 1 into the function to obtain a result of -2. In between 0 and 3 we can substitute any value of □ into f(□) provided that it is larger than 0 or less than 3. This 4 is a positive number and so, we put a positive sign on this region of the sign diagram. ![]() We substitute in □ = -1 to obtain a result of 4. ![]() To the left of the 0 on the sign diagram, we can substitute any value of □ that is less than 0 into f(□). Substitute values from each region into the function to obtain positive or negative outputs ![]() We mark both 0 and 3 on the sign diagram. It can help to factorise a function in order to do this if it is not already factorised. Mark all values for which the function is equal to zero
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