x2 + 5x + 6 = 0
(x + 3)(x + 2) = 0
So x + 3 = 0 or x + 2 = 0
So x = -3 or x = -2
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It is, as stated, x2 - 5x + 25/4 = 0
Assuming you mean x squared plus 5x squared... the answer is 6x squared.
-15x2+5x=-5x(3x-1)
(5x + 2)(x + 3)
-x2+2x