exam Maths Puzzle Numerical Ability

alex is 2 years older than dulce. if the sum of their ages is 54. how old is alex?

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exam Other Question

y=x^2+2x+1 I discriminant for this what I have can you tell me if this right.
d=b^2-4ac, 2*2^2-4*1*1, 8-4=4 Express in terms of logarithms of x, y and z: log7*x^3/yz^4 (the log7 is written as log with a subscript of 7 but I'm not sure how to type that..)