What is the product of (2x+9) (x+1)? Please and thank you.
2 answers:
2x^2 + 11x + 9 You can foil it to get the correct answer, (FOIL = First, Outter, Inner, Last)
First, lets assume x = 5, to start us off. (2 * 5 + 9) = (5 + 1) (I assume that in between the two equations is an = sign because without it, the entire problem would make no sense.) (10 + 9) = (6) 19 = 6 Not the same. So, I think that it would be lower than 5. Let us continue x = 3? (2 * 3 + 9) = (3 + 1) (6 + 9) = 4 15 = 4 Even lower, maybe a negative. x = -5? (2 * -5 + 9) = ( -5 + 1) (-10 + 9) = -4 -1 = -4 Almost there, x = -10? (2 * -10 + 9) = ( -10 + 4) ( -20 + 9 ) = -8 -11 = -8 It is higher that -10. x = -7? (2 * -7 + 9) = ( -7 + 1) (-14 + 9) = -6 -5 = -6 So very close, x = 7.5? ( 2 * -7.5 + 9 ) = ( -7.5 + 1) (-15 + 9 ) = -6.5 -6 = 6.5 EXTREMELY CLOSE, x = 7.75? ( 2 * 7.75 + 9 ) = ( -7.75 + 1 ) (-15.5 + 9 ) = -6.75 -6.5 = -6.75 i.. nvm.. x = -7.8? (2 * -7.8 + 9) = ( -7.8 + 1) (-15.6 + 9) = -6.8 -6.6 = -6.8 omggggggg ----------------------------------------------------- by this point i realized i was doing it wrong again.. q.q here is the correct way to do it: (2x+9) = (x+1) (2x+9) -- (-- x -- 9) - (x+1) -- (-- x -- 9) 2x + 9 - x - 9 = x + 1 - x - 9 2x - 9 + x + 9 = x - 1 + x + 9 2x - x + 9 - 9 = x - x + 1 - 9 x= -8
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