exam Maths Puzzle Numerical Ability

1.) 2x^2 - 5x + 7 � X - 2

2.) a^3 + b^3 + c^3 - abc � a + b + c

3.) 9m^2 + 25 � 3m + 5

4.) 6x^2 - 11 x + 21 � x + 3

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exam Other Question

Write the equation of the line with slope 5 and y intercept (0,-3) I want to know if this problem is correct:

(y-2/3)^2 = 49

y - 2/3 = + or - Square root 2/3

If y - 2/3 = 2/3 then y = 4/3

If y - 2/3 = -2/3 then y = 0

Is this solution correct the way it is worked out?