1 . 2a2+b2=

• A. ${\left(a+b\right)}^2-{\left(a-b\right)}^2$
• B. ${\left(a-b\right)}^2-{\left(a+b\right)}^2$
• C. ${\left(a+b\right)}^2+{\left(a-b\right)}^2$
• D. ${\left(a+b\right)}^2-4ab$

Answer: Option C

Explanation:

2 . 2a2+b2=

• A. ${\left(a+b\right)}^2-2ab$
• B. ${\left(a+b\right)}^2+{\left(a-b\right)}^2$
• C. ${\left(a-b\right)}^2+2ab$
• D. ${\left(a+b\right)}^2-4ab$

Answer: Option B

Explanation: