Question

The value of P such that the vertex of y = x² + 2px + 13 is 4

unit above the x axis is –

• A. 2
• B. – 4
• C. 5
• D. ± 3

Answer 1

Answer: (D)

± 3

Answer 2

Given y=x²+2px+13 vertex is at (– P,13–P²)=(–P,4)

̃ 13 – P² = 4 ̃ P² = 9 \ P = ± 3