$-224 + (-314) \times (-9) = x$
Aptitude
Simplification
Difficulty: Easy
Choose an option
-
A-547
-
B-2602
-
C547
-
D2602
-
ENone of these
Answer
Correct Answer: 2602
Explanation
Concept & Rule
This problem tests the order of operations alongside negative integer arithmetic rules. Multiplication must be performed prior to addition. Crucially, the product of two negative numbers is always a positive number.
Step-by-Step Solution
* Given expression:
$$ -224 + (-314) \times (-9) $$
* Step 1: According to BODMAS, evaluate the multiplication part first.
$$ (-314) \times (-9) $$
Since multiplying two negatives yields a positive:
$$ 314 \times 9 = 2826 $$
* Step 2: Substitute this result back into the original equation.
$$ -224 + 2826 $$
* Step 3: Perform the addition. Since the signs are opposite, subtract the smaller absolute value from the larger one and keep the sign of the larger value.
$$ 2826 - 224 = 2602 $$
Exam Strategy & Shortcut
**Sign and Unit Digit Elimination:**
You can solve this in seconds without full calculations.
First, $(-314) \times (-9)$ will be a large positive number (around $+2700$). Subtracting $224$ will still leave a large positive number. This instantly eliminates options (a) and (b).
Next, look at the unit digits.
The product $4 \times 9 = 36$, so it ends in a $6$.
The addition is essentially $(\text{number ending in } 6) - (\text{number ending in } 4)$.
$6 - 4 = 2$.
The final answer must be a positive number ending in $2$. Option (d) 2602 is the only logical choice.
Common Pitfall
The most common trap is a sign error during multiplication. Students hastily write $(-314) \times (-9) = -2826$, which leads to $-224 - 2826 = -3050$. Always double-check your integer sign rules before moving to the next step.
Final Answer
**Therefore, the correct answer is 2602.**