exam Maths Puzzle Numerical Ability

Calcalate the value for z which

2log3(Y)-log3(y+4)= 2

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exam Other Question

calculate the value of the discriminant of x^2 + 2x +1 = 0, and show work. SOLVE 5(X-2)^2=3

A)10+SQUARE ROOT OF 3 OVER 5
b)10+SQUARE ROOT OF 15 OVER 5
C)+59/25
d)1/5, AND 19/5