book Maths Puzzle Numerical Ability

y^4 -81

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book Other Question

If I need to find the opposite of the expression 7x + 3x. I need to simplify the expression (2 to the square root of 27)x (3 to the square root of 32)? This is also a multiple choice A. 72 to the square root of 6 B.18 to the square root