X2 - 5X - 6 = 0
What two factor of - 6 add up to - 5 ??
(X + 1)(X - 6)
So,
X = - 1
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x2 - 5x = 0x (x - 5) = 0x = 0andx = 5
15x2
10x + 5 unless you know what x & y are * * * * * Perhaps this answer will be of help: x3 + x2 + 5x + 5 = (x + 1)(x2 + 5). If you are willing to go to complex roots, then, x3 + x2 + 5x + 5 = (x + 1)(x2 + 5). = (x + 1)(x + i√5)(x - i√5); in which case, x = -1 or ±i√5.
2
2x+1=5x