exam Maths Puzzle Numerical Ability

Is the following solved correctly?
-2t(t-5tsquared)+(-5tcubed) = -2tsquared+10tcubed+(-5tcubed) = -2tsquared+5tcubed

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exam Other Question

I kind of understand how to do these fog and gof problems, but I dont know how to do this one because of the square root. Please help me!!! Thank you!!!! The problem is:
For {{{ f If the smallest of the three consecutive integer is added to twice the largest, the result is seven less than four times the middle. Find the nos