How many sweets can I buy with one euro if I can get six for 20 cent
2 answers:
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1. Factor the expression
2. Since is placed in the denominator of the given expression, then
3. Now the expression can be simplified:
Let us try and solve it analytically. We have that the side=x+3 together with the short side=s and the diagonal=x+4 satisfy the Pythagorean Theorem. Then we have that 
. This yields 
which yields s^2=2x+7, hence a) is the correct answer.
which yields s^2=2x+7, hence a) is the correct answer.