Further Solving Quadratic Equations (Hidden Quadratics) (AQA A-Level Mathematics): Quizzes

An equation with a quadratic hidden inside

$u = x^2$

$u = \sqrt{x}$

$x = \pm\sqrt{3}$

$u^2 - 6u + 9 = 0$

Square roots must be non-negative

$x = 4$

No real roots

A square number cannot be negative

To simplify the equation to standard form