Question

The value of expression 2a ^ 2 + 2b ^ 2 - ab for a-2, b-lis (a) 2 (b) 8 (c) 6 (d) 10

Answer 1

Answer:

$2a^2 + 2b^2 - ab$ $= 8$

Step-by-step explanation:

Given

$2a^2 + 2b^2 - ab$

Required

Evaluate when $a=2\ and\ b=1$

To do this, we simply substitute 2 for a and 1 for b in $2a^2 + 2b^2 - ab$

$2(2)^2 + 2(1)^2 - 2 * 1$

$2*4 + 2*1 - 2 * 1$

$8 + 2 - 2$

$8$

Hence:

$2a^2 + 2b^2 - ab$ $= 8$

when $a=2\ and\ b=1$