book Maths Puzzle Numerical Ability

expand the brackets in the following

x(3-y)
(x+1)(x+2)
az(z2+bz)
(x+y)(x-y)

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book Other Question

I need a help.

Use the method of "Completing the Square" to solve the following quadratic equations:

3x(x-1)=4
please help solve this
3x=wyz

solve for x, w, and y
please explain so i can try to do others without help, thank you very much