Question 5. [6] Sometimes software optimization can dramatically improve the performance of a computer system. Assume that a CPU can perform a multiplication operation in 10 ns, and an addition or subtraction operation in 1 ns. Assume that the operands (x in the question below) are already loaded into registers. (a) How long will it take for the CPU to calculate the result of x + 2x? (b) Could you optimize the equation so that it will take less time? Show all your steps and comment your rea- soning in order to get full marks