16X + 12X
all I can see here is factoring out a 4X factor
4X(4 + 3)
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Combine like terms, meaning add 12X plus 4X which is 16X and then you add 25Y plus 15Y which equals 40Y so the answer will be 16x+40y. combine like terms means add the ones with the same variable.
(2x+5)(2x+1)
It is equivalent to 3(4x+3y) when factored
x(2x - 3)(x + 4)
12x-4y+9z+2y =12x-2y+9z