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Anonymous
5x2 - 20 = 0
x2 - 4 = 0
x2 = 4
x = +2 and -2
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(5x)2 = 25x2.
5x=4y=-20 x=-4 y=-5 (-4,-5) is the ordered pair
That factors to (x - 2)(x + 7)
It is, as stated, x2 - 5x + 25/4 = 0
(5x - 2y)(5x + 2y)