It is: 4x squared
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7x2 -4x -5x2 +2x = 2x2 -2x
(2x+3)(2x+4)
Oh, dude, that's like basic math, right? So, 2x squared plus x squared is just 3x squared. It's like adding apples to apples, but with math. Easy peasy lemon squeezy!
It equals 53X- a number is squared when it is multiplied by itself, so 7X by 7X = 49X. 2X by 2X =4X, so 49X + 4X is 53X.
2x2 + 5x = x*(2x + 5)