exam Maths Puzzle Numerical Ability

can you show me how to solve #35 [3+(4b+1)]squared
and #39 [(xy+4)-6]squared

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I really need to find something that i can type in the problem and get the answer. Like not to so totally cheat, but like, so i can check it. Im in 9th grade and i had to take Pre- Write a system of two equations in two unknowns for each problem. Solve each system by the method of your choice.

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