Question

(b) Find the value for a= 2 and b= -1 in the given expression 2a2-3b.​

Answer 1

Given :

• a= 2 & b =3

To find :

• find the value of 2a - 3b

Solution:

The value of a is 2

The value of b is 3

We are supposed to find the value of 2a-3b

Expression: 2a-3b

Substitute the values :

So, 2(2)-3(3)=4-9=-5

Hence the value of 2a - 3b is -5

Answer 2

In context to question asked,

We have to determine the value of the expression,

As per question,

$2a^2-3b$

We have to determine the value of expression $2a^2-3b$ when the value of a = 2 and b = -1

So, for determining the value of expression, we will put the value of a and b in above given equation.

Thus we will get,

$2a^2-3b\\=>2(2)^2-3 \times (-1)\\=>2\times 4 +3\\=>8+3\\=>11$

Hence, the value of expression $2a^2-3b$ when the value of a = 2 and b = -1 will be 11.