Easy -1.8 This is a straightforward application of the difference of two squares formula (a+b)(a-b) = a²-b², requiring only basic surd manipulation to get 7-4=3. It's a single-step routine exercise with minimal computational demand, significantly easier than average A-level questions.
\(\sqrt{7}^2 + 2\sqrt{7} - 2\sqrt{7} - 2^2\), or \(7-4\), or exact equivalent such as \(\sqrt{49}-2^2\)
M1
Expanded expression with at most one wrong term and one wrong sign, or two wrong signs.
\(= 3\)
A1
Correct answer with no working scores both marks. ([2] total)
## Question 3:
$\sqrt{7}^2 + 2\sqrt{7} - 2\sqrt{7} - 2^2$, or $7-4$, or exact equivalent such as $\sqrt{49}-2^2$ | M1 | Expanded expression with at most one wrong term and one wrong sign, or two wrong signs.
$= 3$ | A1 | Correct answer with no working scores both marks. (**[2]** total)
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