Home › AP EAPCET (Engineering) › Mathematics › Quadratic Equation › Which constant makes x² + 6x + c a perfect square?
Which constant makes x² + 6x + c a perfect square?
A6
B9
C12
D36
Answer & Solution
Correct answer: B. 9
The constant is (6/2)² = 9, giving (x + 3)².
Related questions
When the discriminant is zero, the two roots of a real quadratic areWhich is the quadratic coefficient in 5x² − 3x + 8 = 0?Subtracting two nearly equal numbers in the quadratic formula causesThe vertex x-coordinate of a parabola equals the mean of itsFinding the half-angle cosine from a known cosine involves solving aCritical points of a cubic function are found by solving aDescartes' theorem on four kissing circles gives their radii aConic sections such as the circle are all described by