Question

If the quadratic equations ax² +2cx + b = 0 and ax² + 2bx + c = 0 have a common root then a + 4b + 4c is equal to

• A. –2
• B. –1
• C. 0
• D. 1

Answer 1

Answer: (C)

0

Answer 2

aa² + 2ca + b = 0

aa² + 2ba + c = 0

on subtracting a = $\frac{1}{2}$Ž $\frac{a}{4}$+ c + b = 0

a + 4b + 4c = 0