(13x + 39)(x + 2)
* * * * *
Don't you think it might, instead, be
(13x - 39)(x - 2)?
Multiply it out, and see!
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X3 + 13X2 + 40X factor out an X X(X2 + 13X + 40) factor the quadratic expression, what two factors of 40 add up to 13? X(X + 8)(X + 5) works the same if that is a negative in front of X3, just sign changes
26
x3 + 13x2 + 42x = x(x + 6)(x + 7).
no. it can be simplified into 13x2. 13 and 2 are prime.
13x1=13 13x2=26...etc