Question

the value of expression 2a2+2b2-ab for a=2 b=1 is
a.2
b.8
c.6
d.10​

Answer 1

Given:

An algebraic expression 2a² + 2b² - ab.

To Find:

The value of the expression at a = 2 and b = 1 is?

Solution:  

The given problem can be solved using direct substitution.  

1. The given expression is 2a² + 2b² - ab.  

2. Substitute the value a = 2 and b = 1 to get the value of the expression.  

=> Value = 2a² + 2b² - ab,  

=> Value = 2(2)² + 2(1)² - (2)(1)  

=> Value = 2(4) + 2(1) - 2,  

=> Value = 8 + 2 - 2,  

=> Value = 8.  

3. Value of the expression at a =2 and b = 1 is 8.

 

Therefore, the value of the polynomial 2a² + 2b² - ab at a = 2 and b = 1 is 8. Optuon B is the correct answer.