Proof

74%

$x\,$ is an integer. Prove algebraically that the sum of $x (x + 5)$ and $x + 9$ is always a square number.

[2]

74%

$x\,$ is an integer. Prove algebraically that the sum of $x (x + 5)$ and $x + 9$ is always a square number.

[2]

Proof Questions