Question

If a=3 and b=4 , Evaluate 2a²-b²​

Answer 1

Answer:

a = 3, b = 4

2a²- b² = 2(a²-2ab+b²)

= 2(3²-2×3×4+4²)

= 2(9-24+16) = 2(9-40) = 2(-13)

= -62

Answer 2

Question -:

If a = 3 and b = 4, then evaluate -:

$2 {a}^{2} - {b}^{2}$

$\sf\underline{Solution }\dag$

Given -:

a = 3.

b = 4.

To find -:

$2 {a}^{2} - {b}^{2}$

Step-by-step explanation -:

Since a = 3 and b = 4, therefore to evaluate we need to replace the variables.

After replacing the variables by their values, we get -:

$2 {a}^{2} - {b}^{2} = 2 \times {3}^{2} - {4}^{2}$

Now, lets solve it -:

$2 \times {3}^{2} - {4}^{2}$

$2 \times 9 - 16$

$18 - 16$

$2$

So, the answer is 2.

Hope it helps! :)