Problem: (6x + 3) (-5x + 2) My answer 30x2 - 30x -16
R RachelH New member Joined Dec 4, 2011 Messages 1 Dec 4, 2011 #1 Problem: (6x + 3) (-5x + 2) My answer 30x2 - 30x -16
M Mrspi Senior Member Joined Dec 17, 2005 Messages 2,128 Dec 4, 2011 #2 RachelH said: Problem: (6x + 3) (-5x + 2) My answer 30x2 - 30x -16 Click to expand... To multiply two binomials together, multiply each term in the first set of parentheses by each term in the second set of parentheses: (6x + 3)(-5x + 2) = 6x *(-5x) + 3*(-5x) + 6x*2 + 3*2 Do the multiplications: -30x2 + (-15x) + 12x + 6 And combine like terms. I'll let you do that part. Does that match what you did, and what you got?
RachelH said: Problem: (6x + 3) (-5x + 2) My answer 30x2 - 30x -16 Click to expand... To multiply two binomials together, multiply each term in the first set of parentheses by each term in the second set of parentheses: (6x + 3)(-5x + 2) = 6x *(-5x) + 3*(-5x) + 6x*2 + 3*2 Do the multiplications: -30x2 + (-15x) + 12x + 6 And combine like terms. I'll let you do that part. Does that match what you did, and what you got?
N nyc_function New member Joined Dec 10, 2009 Messages 39 Dec 5, 2011 #3 FOIL Method RachelH said: Problem: (6x + 3) (-5x + 2) My answer 30x2 - 30x -16 Click to expand... Use the FOIL method. 6x times -5x = -30x^2 6x times 2 = 12x 3 times -5x = -15x 3 times 2 = 6 Put it all together. -30x^2 + 12x - 15x + 6 Combine like terms as shown in green. So, what is 12x - 15x? It is -3x, right? Final answer: -30x^2 - 3x + 6 Done!
FOIL Method RachelH said: Problem: (6x + 3) (-5x + 2) My answer 30x2 - 30x -16 Click to expand... Use the FOIL method. 6x times -5x = -30x^2 6x times 2 = 12x 3 times -5x = -15x 3 times 2 = 6 Put it all together. -30x^2 + 12x - 15x + 6 Combine like terms as shown in green. So, what is 12x - 15x? It is -3x, right? Final answer: -30x^2 - 3x + 6 Done!
