x2+5x-6 = (x+6)(x-1) when factored
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(7x + 2)(3x - 5)
Yes, although we generally refer to polynomials with two terms, like this one, as binomials.
Two is a prime factor of that equation.
To multiply two binomials you use FOIL (first, outer, inner, last): (y-9)(y+10)=y*y+10y-9y-9*10=y2+y-90
It is only not needed if you know of another method. If FOIL is the only way you know to multiply two binomials, then it is definitely needed.