Algebramedium · Past Paper
The discriminant of √2x^2 + 7x + 5√2 = 0 is:
A9
B49
C25
D0
✓ Correct Answer: A — 9
D = 7^2 - 4(√2)(5√2) = 49 - 4(5)(2) = 49 - 40 = 9.
Share this question
More from Algebra
- The roots of the equation x^2 - 7x + 12 = 0 are:
- For what k does x^2 - kx + 1 = 0 have no real roots?
- If roots of x^2 - kx + 4 = 0 are equal, find k.
- A two-digit number is 4 times the sum of its digits. If 18 is added to the number, the digits are reversed. Find the number.
- If x^2 - 4x + 1 = 0, then the value of x + 1/x is: