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secondary 4 | A Maths
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Pls help me with this question. Preparing for o levels. Thank you very much!!!
From the coordinates, we have :
when x = 2, y = 16
when x = 3, y = 32
when x = 5, y = p
we can form 3 equations by subbing these values.
From the first set of coordinates,
16 = ka² ①
From the second set,
32 = ka³ ②
From the third set,
p = ka^5 ③
since a and k are constants,
we can divide ② by ①,
32/16 = ka³/ka²
2 = a
(If it's a variable x then we cannot divide like this since we would be removing a possible result)
Now we sub a = 2 back into ②(or ① , up to you)
32 = k(2³) = 8k
k = 32/8 = 4
Now sub a = 2 and k = 4 into ③
p = 4(2^5) = 128
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