# can someone plz help me with my algebra homework?

Topic: can someone plz help me with my algebra homework?
June 18, 2019 / By Annabelle
Question: these are the problems below...i just dont know what to do c(c+7)=0 (x-9)(3x+5)=0 a squared -a=6 thank you so much in advance!! thank you so much everybody for explaining.... coming back from winter break is brutel when remebering algebra so thanks again!

## Best Answers: can someone plz help me with my algebra homework?

Winthrop | 8 days ago
I don't know how to express this as an equation, but the last one a=3. The backwards way to solve it is you take the squares of small numbers, 2 squared is four, that's too small. 3 squared is 9. You subtract 9-3 = 6. 4 squared is 16, 16-4= 12, so that's too much.
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2l = w 2l + 2w = p p = 42 2l + 2(2l) = 42 2l + 4l = 42 6l = 42 l = 7 w = 14 the dimensions are 14 x 7 x + (1.5x) = 850 2.5x = 850 x = 340 one friend pays 340 and the other 510 15 + 2.05g = 2.35g 15 = .30g g = 50 gallons need to be bought in a month 3 + 5.5h = 7h 3 = 1.5h h = 2 hours for him to catch up

Shamus
These look like factoring: For the first two, you set each equal to 0... c in the first one is like c+0, so c+ 0 = 0. c = 0. c+7 = 0, so c = -7 So your two answers are -7 and 0 The second you have x-9 =0 so x = 9 and 3x+5 = 0 so x = (-5/3) because you subtract 5 by both sides and then divide by 3 to get x alone. So your two answers are 9 and -5/3 a sqaured - a = 6, you will need to move the 6 to the other side by subtracting. You need the equation to equal 0. a squared - a -6 = 0. Now you will need to factor that into two binomials (a-3)(a+2) = 0. now a-3 = 0 so a = 3 and a+2 = 0 so a = -2 Your two answers are 3 and -2
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Newton
c(c+ 7 ) = 0 use the zero product property either c= o or c+7 = 0 c = 0 or c = -7 (x-9)(3x+5)=0 use zero product property again x -9 = 0 or 3x + 5 =0 x = 9 or 3x = -5 x = 9 or x = -5/3 a^2 - a = 6 a^2 - a - 6 = 0 (a -3)(a+2) = 0 a - 3 = 0 or a+2=0 a = 3 or a = -2 hope that helps!
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Kirk
c(c+7)=0 C=0 and c=-7 x-9=0 and 3x+5 =0 x=9 and 3x=-5 x=9 and x =-5/3 A squared -a =6 A squared -a -6=0 (a+2)(a-3)=0 a=-2 and a=3
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Hyram
1 c(c+7)=0 you have to multiply c+7 by c so you get c^2 +7c=0 depending on what the homework question is will determine what you have to do next. #2 basically you do this: x * 3x =3x^2 x * 5 = 5x -9 * 3x = -27x -9 * 5 = -45 9add liked terms and you get: 3x^2 - 22x -45 (i don't know if you have to foil it, but this is simplest form) #3 -a=6 finding the square of -a would be i(square sign)a =2(square sign)3 i can't make the sign here but here is a link to what it is sappost to look like. just put it where i said, and take out the x. http://etc.usf.edu/clipart/41700/41750/FC_SqRootX_41750_lg.gif hope this helps
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