have to do the FOIL method
(4x - 9) (3x - 5)
answer i came up with is
12x^2 - 20 - 27x - 45
2007-04-24 03:22:45 · 15 answers · asked by Carrrie J 1 in Science & Mathematics ➔ Mathematics
yea I realized after i posted this, that I forgot an x on one of the terms
2007-04-24 03:35:09 · update #1
Not quite...
(4x - 9)(3x - 5)
= (4x)(3x) + (-5)(4x) + (-9)(3x) + (-9)(-5)
= 12x^2 - 20x - 27x + 45
The second term is missing an x (typo?).
The last term should be positive. (-9)(-5) = +45
2007-04-24 03:28:27 · answer #1 · answered by Mathematica 7 · 1⤊ 3⤋
(4x-9)(3x-5)
12x^2-20x-27x+45=
12x^2-47x+45
You made the mistake on last number. When you multiply a negative with a negative, the number ends up being a positive.
2007-04-24 10:36:33 · answer #2 · answered by Anonymous · 0⤊ 0⤋
well i dont know if its almost right. 12x^2 - 20x - 27x + 45. remember a negative times a negative = a positive, and 4x * -5 = - 20x. the x's can be grouped together so your final answer is 12x^2 - 47x + 45
2007-04-24 10:29:00 · answer #3 · answered by priestincamo 2 · 1⤊ 0⤋
4x * 3x = 12x^2
4x * -5 = -20x
-9 * 3x = -27x
-9 * -5 = 45
12x^2 - 20x -27x + 45 = 12x^2 - 47x + 45
2007-04-24 10:32:28 · answer #4 · answered by l77onica 2 · 2⤊ 0⤋
4x * 3x=12x^2
4x* -5=-20x
-9 * 3x=-27x
-9 * -5=45 ( negative * negative= positive)
answer is 12x^2-47x+45
2007-04-24 10:53:00 · answer #5 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
well lets see.
(4x-9)(3x-5)
4x*3x-4x*5-9*3x-(9*-5)
12x(squared)-20x-27x+45
12x(squared)-47x+45
so, yes/no. yes you did the correct FOIL method, but you didnt do the multiplcation correctly, like 12x*2 you had is 12x squarred, or 12x*x. also its positive 45, because minus a negitive equals plus a positive. plus you didnt simplify. but its okay, you are getting there.
are you in algebra? thats what im in.
2007-04-24 10:33:57 · answer #6 · answered by Jaim 2 · 1⤊ 0⤋
close. its 12x^2-20x-27x+45 or 12x^2-47x+45. remember a negative times a negative is a positive.
2007-04-24 10:26:24 · answer #7 · answered by (♥_♥) 6 · 2⤊ 0⤋
(4x - 9) (3x - 5)
Should be
12x² -20x -27x + 45
You are on the right track!
Don't forget the x in both of the middle terms.
For the last term, negative*negative = positive, so add the constant at the end.
2007-04-24 10:25:31 · answer #8 · answered by MamaMia © 7 · 1⤊ 1⤋
no you did it wrong.....it should be
12x^2 - 20x - 27x - 45. you just forgot to multiply the x through when you multiplied the -9 and the 3x
2007-04-24 10:35:17 · answer #9 · answered by kmtpa7 2 · 1⤊ 2⤋
no, it should be..
12x^2 - 20x - 27x + 45
= 12x^2 - 47x + 45
2007-04-24 10:25:50 · answer #10 · answered by Fwapi 2 · 2⤊ 0⤋