book Maths Puzzle Numerical Ability

Sum the polynomials 2x^2 - 3x - 4, 2x - 5 and 3x^3 + 2x^2 - 6.

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book Other Question

Wut does ( ) that mean in an order of an operation problem? System of Equations with 3 variablies

4x � 5y � 5z = �24
�x � y + 3z = 13
5x + y + 4z = 11