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Question

If y=7+7+8+277, then find the value of y. [3 marks]

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Solution

We see that,
y=7+7+8+277
Here, 8+27=7+1+27=(7+1)2
On solving for y, we get
[1 mark]
y=7+7+(7+1)27
y=7+7+(7+1)7
y=27+7+17
Using identity, we get
[1 mark]
y=(7+1)27
y=(7+1)7
y=1
[1 mark]

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