1 . a2-b2=15

• A. 4
• B. 3
• C. 2
• D. 1

Answer: Option A

Explanation:

2 . a-b=5

• A. $x^2+4x+3=0$
• B. $x^2-3x-4=0$
• C. $x^2+3x+5=0$
• D. $x^2+3x-4=0$

Answer: Option B

Explanation: