Question

Which quadratic function contains the points (1, −6 ), (−2, 15) , (3, 30)?

a) f(x) = 2x^2 − 9x + 5

b) f(x) = 5x^2 − 9x − 2

c) f(x) = 9x^2 − 2x − 5

d) f(x) = 5x^2 − 2x − 9

Answer 1

• d) f(x) = 5x^2 − 2x − 9

Explanation:

Verify by graphing.

All three given points (1, −6 ), (−2, 15) , (3, 30) appear on the last function's graph.

• f(x) = 5x^2 − 2x − 9