2655 Shares Topic: 8th grade Algebra help! Please!?
June 16, 2019 / By Astra
Question: I know how to do it, but now these expressions are getting longer and more confusing. And I'm just getting stumped =/ Can you explain how to do these for me PLEASE? 9(a+b) + 4(3a+2b) 8(k+m)+15(2k+5m) 6(r+5)+9(r-2)-4r 4(n+7)+5(n-3)-2n 7(c+2d+8)+3(9c-2) 4(5x+3y+6)+14(2y-1) Thanks!! ~Laya♥  Abagail | 3 days ago
👍 114 | 👎 3 Originally Answered: 8th grade Algebra help!?
3x + 4xy + 5 x = 4/3 y = 3/2 Plug in the values of x and y and simplify. 3(4/3) + 4(4/3)(3/2) + 5 = 4 + 4(12/6) + 5 = 4 + 4(2) + 5 = 4 + 8 + 5 = 17 Sorrel
Okay, (: this is what i am did last yearrr . soo lets take the first one for example, 9(a+b) + 4(3a+2b) the first thing you must do is distribute the 9, to do this you multiple the 9 by a abd b. the equation is now : 9a+9b+4(3a+2b) next, you distribut the 4. to do this you multiply 4 by 3a and 2b. 9a+9b+12a+8b now you simplify like terms! like terms are the ones with the same variables. so 91 and 12 a are lkike terms, as well as 9b and 8b. your final answer will be : 21a+17b here are the steps to the second one : 8(k+m) + 15(2k+5m) 8k+8m+15(2k+5m) 8k+8m+30k+75m 38k+83m i will also show you the steps to one of the harder ones - 4(5x+3y+6)+14(2y-1) 20x+12y+24+28y-14 20x+40y+10 GOOD LUCK, (: hope i helped you!
👍 40 | 👎 -4 Osgood
When you see an algebraic term like 9(a+b), it means that before you can add it to another term or do anything else with it, you must multiply the 9 times the a and then the b. Example: 9 times a =9a. 9 times b = 9b. Then combine them: 9a+9b. Do the same with the 4(3a+2b) 4 times 3a = 12a; 4 times 2b = 8b; combine them: 12a+8b Now combine the two terms: 9a + 9b +12a +8b _________ 21a + 17b do the same thing for the rest paying attention to the negative/positive signs. good luck
👍 38 | 👎 -11 Leolin
9(a+b) + 4(3a+2b) First, distribute. 9a+9b + 12a+8b Then simplify the like terms. 21a + 17b 8(k+m) + 15(2k+5m) Again, distribution first. 8k+8m + 30k+75m Simplify. 38k + 83m 6(r+5) + 9(r-2)-4r Distribute. 6r+30 + 9r-18-4r Simplify. 11r+12 4(n+7) + 5(n-3)-2n. Distribute. 4n+28 + 5n-15-2n Simplify. 7n + 13 7(c+2d+8) + 3(9c-2) Distribute. 7c+14d+56 + 27c-6 Simplify. 33c+14d+50 4(5x+3y+6) + 14(2y-1) Distribute. 20x+12y+24 + 28y-14 Simplify. 20x+40y+10. Kay, I hope these are all right and help you understand a bit more...I'm not really great at the explaining, but I hope I helped a little.
👍 36 | 👎 -18 Jalen
Do you want them simplified for you, or to learn it yourself? I hope the second one, because grade nine takes this and adds another level of pain, haha :) Ok, for the first one. The nine will times itself with the a and the b, turning into 9a + 9b. The four will do the same, and become 12a + 8b. Adding together the like terms (9a + 12a and 9b + 8b) you'll wind up with the answer of 21a + 17b. The rest of the equations are basically the same thing, so if you get the gist of like terms and mulitplying the inside by the number outside then adding the results, you'll be fine. I know it's hard to wrap your head around, but after you do, it'll free flow like nothing else. I hope this helps, and good luck on homework and any following tests/assignments! : )
👍 34 | 👎 -25 Originally Answered: Help with finding the sum of this? 8th grade algebra.?
Just add together the like terms: 7a^3 + 3a^2 - a + 2 + 8a^2 - 3a - 4 7a^3 + 3a^2 + 8a^2 - a - 3a + 2 - 4 7a^3 + 11a^2 - 4a - 2