2023 Further Mathematics Questions and Answers (Obj/Theory)

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2023 Further Mathematics Questions and Answers (Obj/Theory)


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2023 Further Mathematics Questions and Answers (Obj/Theory).

Past Essay (Theory) answers

X-3|2 2|+4|5 2 |+3|5 2|= -24

To resolve this equation, we need to simplify the expressions within the absolute value signs.

|2 2| equals 2 - 2, which is 0.
|5 2 | equals 5 - 2, which is 3.
|5 2| equals 5 - 2, which is 3.

Now we substitute these values back into the equation:

(X - 3)(0) + 4(3) + 3(3) = -24

0 + 12 + 9 = -24

21 = -24

Since 21 is not equal to -24, there is no solution to this equation.

Log 3x - 3logx³ + 2 = 0
To resolve this equation, let's simplify it step by step:

Log 3x - 3log3³/log3x + 2 = 0

Using the property of logarithms, we can rewrite log3³ as 3log3:

Log 3x - 3 * 3log3 / log3x + 2 = 0

Now let's simplify further:

Log3x - 9 / log3x + 2 = 0

Let's introduce a substitution to make it easier. Let p = log3x:

p - 9 / p + 2 = 0

To eliminate the fraction, let's multiply through by (p + 2):

p(p + 2) - 9 = 0

p² + 2p - 9 = 0

Now let's solve this quadratic equation:

(p + 3)(p - 3) = 0

p = -3 or p = 3

But we remember that p = log3x, so:

log3x = -3 or log3x = 3

Now let's solve for x:

When log3x = -3:
3x = 3^(-3)
3x = 1/27
x = 1/27

When log3x = 3:
3x = 3^3
3x = 27
x = 27/3
x = 9

So the solutions to the equation are x = 1/27 and x = 9.

3a) U = x - 2, therefore x = u + 2.

Now let's substitute this back into the expression:
(x^2 + 5) / (x - 2)^4

Substituting x = u + 2:
((u + 2)^2 + 5) / (u + 2 - 2)^4
((u + 2)^2 + 5) / u^4
(u^2 + 4u + 4 + 5) / u^4
(u^2 + 4u + 9) / u^4

3b) Simplifying further:
(u^2 + 4u + 9) / u^4

So, the expression simplifies to (u^2 + 4u + 9) / u^4.

S12 = 12/6[2a + 11d] = 168
To solve this equation, we use the formula for the sum of an arithmetic series:
Sn = n/2[2a + (n - 1)d]

Given that S12 = 168, we have:
12/2[2


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