x(x + 1)
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x2 + 10x + 21 = (x + 3)(x + 7)
Plus or minus the base. If the base is X and you square it, you get X2. If you take the square root of that, you get Plus or Minus X. This is because X*X equals X2 and -X*-X also equals X2.
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
x2 + x - 30 = (x + 6)(x - 5)
x(x+4) equals x2 plus 4x