Algebrahard · Past Paper
If the roots of x^2 - bx + c = 0 are two consecutive integers, then b^2 - 4c equals:
A0
B1
C2
D4
✓ Correct Answer: B — 1
Roots are n, n+1. Difference (α-β)^2 = 1. (α+β)^2 - 4αβ = b^2 - 4c = 1.
Share this question
More from Algebra
- A man starts his job with a certain monthly salary and a fixed increment every year. If his salary was Rs 15000 after 4 years and Rs 18000 after 10 years, find starting salary.
- Find the values of x and y using the method of cross-multiplication.
- Find the condition for ax^2 + bx + c = 0 to have roots in ratio 3:4.
- If a number is added to its half, the result is 12. Find the number.
- Which of the following is a trinomial?