book Maths Puzzle Numerical Ability

please help me im doing my homework can you help me on this.

(-2n)(-n^2)

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Can someone please help with the following qustion. My 13 year old daughter brought this home on a worksheet and we are arguing about the answer. Math (algebra or anything with l Use the Intermediate Value Theorem to show that the graph of the function has a zero in the given interval. Round the zero to two decimal places.
f(x) = 2x3 + x2 - x - 5; [1, 2] Please help