2015 A-level H2 Mathematics (9740) Paper 1 Question 1 Suggested Solutions

All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

(i)
At $(1.6, -2.4), ~0.390625a + 1.6b + c = -2.4 \rightarrow (1)$

At $(-0.7, 3.6), ~\frac{1}{0.7^2}a - 0.7b + c = 3.6 \rightarrow (2)$

$\frac{dy}{dx}|_{x=1} = 2$

$\Rightarrow -2a + b = 2 \rightarrow (3)$

Using GC, $a \approx -3.593, b \approx -5.187, c \approx 7.303$ (to 3 decimal place)

(ii)
Using GC, $x = -0.5890038 \approx -0.589$ (to 3 decimal place)

(iii)
$y = -5.19x +7.30$ (to 3 sig fig)

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KS Comments:

Students should be careful when they substitute. Very easy to make a careless mistake here. No need to actually rearrange the question actually. And since the question wants answers in 3 dp for (i) and (ii), but didn’t state anything for (iii) we should round off to 3 significant figures as per normal.

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KS Teng

KS has been teaching H2/H1 Mathematics and IB mathematics for the more than 10 years. Having taught students from all various Junior Colleges, KS adapts to students' abilities and help them better understand the topics. As someone who loves to teach mathematics and sees it as a truly useful tool in life, KS seeks to enable students to appreciate math. Therefore, his tuition mission is to motivate and cultivate students to be independent and confident thinkers.

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2015 A-level H2 Mathematics (9740) Paper 1 Question 1 Suggested Solutions

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