Laura orders 50 m² of concrete paving slabs. The slabs cost £16.75 per m². How much do the slabs cost in total
1 answer:
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First show the statement holds for 
. The left hand side is just 8, and the right hand side is 
, so it's true.
Assume the statement holds for
, i.e.
and use this to show it holds for
, i.e.
By the assumption above, you have
so the statement is true for all
.
Assume the statement holds for
and use this to show it holds for
By the assumption above, you have
so the statement is true for all