I tryed to foil Evaluate/Simplify: ( x - 1) (2x + 3) but I seem to end up with 2x^2+3x-x-2 but the answer is 2x^2 + x - 3. Where did I go wrong?
2007-08-13 03:09:37 · 5 answers · asked by Chris 2 in Science & Mathematics ➔ Mathematics
You're right Mikey, I've no idea what I was thinking, I did subtract them. Thank you so very much.
2007-08-13 03:19:00 · update #1
= (x - 1) (2x + 3)
= 2x² + 3x - 2x - 3
= 2x² + x - 3
2007-08-16 21:31:20 · answer #1 · answered by Como 7 · 0⤊ 0⤋
When you did the OI part of FOIL, you should get 3x - 2x , to get just x...........and for the L part , I think you subtracted when you should have multiplied, thus you should get - 3. Thus the answer is 2x^2 +3x - 2x - 3 = 2x^2 + x - 3
2007-08-13 03:17:40 · answer #2 · answered by Mathguy 5 · 0⤊ 0⤋
Multiply (x - 1) by 2x:
(x - 1) * 2x = 2x^2 - 2x
Multiply (x -1) by 3:
(x - 1) * 3 = 3x - 3
Add the two products and simplify:
2x^2 - 2x + 3x - 3
2x^2 + x - 3 The correctly simplified equation
Reconciliation:
Your answer: 2x^2 + 3x - x - 2
The answer: 2x^2 + 3x -2x - 3
Difference: - x - 1
Answer: you lacked - x - 1
Instead of - 2x you answered - x only and instead of - 3 you answered - 2 only.
2007-08-13 03:30:22 · answer #3 · answered by Jun Agruda 7 · 2⤊ 0⤋
( x - 1) (2x + 3) = x(2x)+3x-2x-3 = 2x^2 + x - 3
The constant term is the Last x the Last = (-1)(3) = -3
2007-08-13 03:13:49 · answer #4 · answered by sahsjing 7 · 0⤊ 0⤋
(x - 1)(2x + 3)
2x^2 + 3x - 2x -3
2x^2 + x - 3
2007-08-13 03:14:31 · answer #5 · answered by roniloveu15 2 · 0⤊ 0⤋