You must first know what 5 and -4 is. The answer is -20. Since 4x5 is 20. Then just add the negative sign! After that, subtract 8 from -20. A negative subtract negative is always negative. So, -28.
Look at the words that they give you and you would see that "than" means "introducing a second element" which tells us that we multiply 5 & -4 first, then subtract 8.
