If 2a+b=9 and ab=-4, then 4a square + b square is equal to
Answers
Answered by
4
Answer:
65
Step-by-step explanation:
(2a+b)^2 = 4a^2+ 4ab+ b^2 = 9^2
4a^2 +b^2 = 81-4ab = 81- 4×4 = 81- 16 = 65
answer = 65
Similar questions