Question

find the product of (a+8b)(5a-3)​

Answer 1

To find : product of $(a + 8b )(5a-3)$

Solution :

• Multiplication is a process of repetitive addition of integers.
• Multiplication rules for integers :

1. If two negative integers are multiplied then the product obtained is positive integer. i.e. $(-) \times(-)=+$
2. If one negative and one positive integers are multiplied then the product obtained is negative integer. i.e.$(-) \times(+)=-$
3. If both positive integers are multiplied then the product obtained is positive integer. i.e. $(+) \times(+)=+$

• Therefore according to above rule we solve by multiplying terms of first bracket one by one with terms of second bracket .
• $(a + 8b )(5a-3)$  

       $= 5a^{2} -3a +40ab -24b$

Hence , product of $(a + 8b )(5a-3)$ is $5a^{2} -3a +40ab -24b$ .