Question 88 – 1.4 A: Proof - AQA A Level Maths Questions

A laser beam travels in a straight line from a source $S\,$ to a detector $D$ , passing through a filter $F$ . The points $S$ , $F$ , and $D\,$ have position vectors $s\mathbf{s}$ , $f\mathbf{f}$ , and $d\mathbf{d}$ respectively. Given that $F\,$ lies between $S\,$ and $D\,$ such that the ratio of distances $S F : S D = 2 : 7$ , show that:

\mathbf{d} = \frac{1}{2}(7\mathbf{f} - 5\mathbf{s})

Given that $\in \mathbb{Z}$ , prove by contradiction that if $n^2\,$ is a multiple of 3, then $n\,$ is a multiple of 3.

\mathbf{d} = \frac{1}{2}(7\mathbf{f} - 5\mathbf{s})

Given that $\in \mathbb{Z}$ , prove by contradiction that if $n^2\,$ is a multiple of 3, then $n\,$ is a multiple of 3.

1.4 A: Proof

Question 76

1.4 A: Proof

Question 76

1.4 A: Proof

Question 76

1.4 A: Proof Questions

1.4 A: Proof

Question 76

1.4 A: Proof Questions