1. Simplify: $$ -7 a^{2} b-2 a^{2} b $$ A. -9 B. $$ -9 a^{2} b $$ C. $$ -5 a^{2} b $$ D. -5 3. Simnlifi.

Question

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Simplify the expression by following steps:
- step0: Solution:
  $$-7a^{2}b-2a^{2}b$$
- step1: Collect like terms:
  $$\left(-7-2\right)a^{2}b$$
- step2: Subtract the numbers:
  $$-9a^{2}b$$
To simplify the expression $$ -7 a^{2} b - 2 a^{2} b $$, we can follow these steps:

1. **Identify like terms**: Both terms, $$ -7 a^{2} b $$ and $$ -2 a^{2} b $$, have the same variable factors $$ a^{2} b $$.

2. **Combine the coefficients**: 
   $$
   -7 + (-2) = -9
   $$

3. **Write the simplified expression**: 
   $$
   -9 a^{2} b
   $$

Thus, the simplified expression is $$ -9 a^{2} b $$.

The correct answer is **B. $$ -9 a^{2} b $$**.
The simplified expression is $$ -9 a^{2} b $$.

Simplify:
A. -9
B.
C.
D. -5

Simnlifi.

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Simplify: A. -9 B. C. D. -5 Simnlifi.