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This question is incomplete.
2x2 + 3x - 100 can not be solved unless you tell us what it is equal to.
-x2+2x
2x2 + 2x = 2x(x+1)
(2x - 5)(2x - 5) or (2x - 5) squared
(2x - 3)(2x - 3)
2x2 + 28xy + 98y2 = 2(x + 7)2.
use the calculator
It is: 4x squared
4
7x2 -4x -5x2 +2x = 2x2 -2x
(2x+3)(2x+4)
(2x+3)(x+3)
(x + 1)(2x + 5)
(2x + 1)(x + 2)
(2x+10)(x+4)
Yes it is. The thing that makes it a quadratic equation is that "x squared" in there.