3.1 Proof (A-level only)

i.

Use proof by contradiction to show that for all real values of $x$ ,

6)^2 \geq 2x - 46

[3]

ii.

Show that the following statement is untrue:

" $2^n + 2n - 1$ is a prime number for all values of $\in \mathbb{Z}^{+}$ ."

[3]

i.

Use proof by contradiction to show that for all real values of $x$ ,

6)^2 \geq 2x - 46

[3]

ii.

Show that the following statement is untrue:

" $2^n + 2n - 1$ is a prime number for all values of $\in \mathbb{Z}^{+}$ ."

[3]

3.1 Proof (A-level only) Questions