exam Maths Puzzle Numerical Ability

(7x2 � x + 1) � (2x2 � x � 3) � (5x2 + 3x � 10)

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exam Other Question

Can someone help me on this problem #52, page 562 in the textbook I showe above.
Just in case you don't have the book, here is the problem:

I need to find the constant of va 2/3A-3/4A=3/4A