Quadratics

What is the value of \(x\) if \(x^2 - 9 = 0\)?

Which of the following is a quadratic expression?

If \(y = 2x^2 - 4x + 1\), what is the value of \(y\) when \(x = 3\)?

The quadratic equation \(x^2 - 6x + 9 = 0\) has:

Which of the following is the factored form of \(x^2 + 5x + 6\)?

A cricket ball is thrown upwards and its height \(h\) (in meters) after \(t\) seconds is given by \(h = -5t^2 + 20t + 1\). What is the maximum height reached by the ball?

Solve for \(x\): \(2x^2 - 7x + 3 = 0\).

The graph of a quadratic function \(y = ax^2 + bx + c\) passes through points \((1, 6)\), \((2, 11)\), and \((3, 18)\). What is the value of \(a\)?