Question

If both roots of equation x² – ax – 8 = 0 lie in interval (– 2, 2) then set of all values of a is

• A. (0, 5)
• B. (– ∞, 2)
• C. (- , – 2)
• D. f

Answer 1

Answer: (D)

f

Answer 2

Use following conditions

(i) D ³ 0

(ii) f(–2) > 0

(iii) f(2) > 0

(iv) – 2 < $\frac{a}{2}$< 2