Math Problems : Quadratic Equation
For what value of m will the roots of the quadratic equation x2
+ mx + 4 = 0 have real and equal roots?
- 4 or -4
Choice (3). 4 or -4
The question states that the roots of the equation are real and equal.
The roots of a quadratic equation of the form ax2
+ bx + c = 0 will be real and equal if its discriminant D = b2
- 4ac = 0
In this case, b = m, a = 4 and c = 4.
- 4 * 4 * 1 = 0
Orr m = +4 or m = -4.
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