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Solve:

3x(x+4)+3(x+4)=0

Emma

Answers

First, expand the bracketsSo 3x^2+12x + 3x+12 =0Then simplify it all out - ax^2+bx+c=0 is the format you want the question in to solve3x^2 + 15x +12 =0This is the same as 3(x^2+5x+4)=0Now you need to find 2 numbers to multiply to make 4 (c in the equation) that also add to make 5 - 1 and 4.Therefore x=-1 and x=-4Check it in the equation and see if it equals 0, if it does it's right

Kasim A.

13 April 2017

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Kasim A.

13 April 2017

expand the brackets3x^2 + 12x + 3x + 12 = 0Gather like terms3x^2 + 15x + 12=0simplify by dividing the whole equation by 3x^2 + 5x + 4 = 0Factorise (two numbers that added give you 5 and multiplied give you 4)(x+1)(x+4) = 0Thus, the two solutions are x=-1 and x=-4

manfred.olbrich

17 April 2017

given the equation, we can say that we have (x+4) in common.So, we take that out, (x+4), we will have another bracket, (3x+3).We can say that (x+4)(3x+3)=0now we can equate, we can say either (x+4)=0 or (3x+3)=0 x=0 -4 or 3x=0-3 x= -4 or x=-3/3 x=-4 or x=-1

shahnaaz1309

21 April 2017

Browndaisha !simply remember in math there is rule of DMAS. it says 1. Division,2 Multlipication,3.Addition and 4.Subtraction. in any equation follow these steps.you will get result.

mijaz

27 April 2017

3( x+4)(x+1)=0X= -4, -1

shabanam1982

04 May 2017

3( x+4)(x+1)=0X= -4, -1

shabanam1982

04 May 2017

Firstly take the bracket of (x+4), if x+4=0 then x must be equal to -4.The other numbers make another bracket of (3x+3). If 3x+3=0, then 3x=-3 and so x is equal to -1

libbydale1

04 May 2017

3x(x+4) = 3x^2 +12x3(x+4) = 3x + 12So: 3x(x+4) + 3(x+4) = 3x^2 +12x + 3x + 12 ----> just expanded the brackets Therefore: 3x^2 +12x + 3x + 12 = 0Simplify it to: 3x^2 + 15x + 12 = 0Factorise to get: (3x + 3) (x+4) = 0Therefore: (3x + 3) = 0 or (x+4) = 0If: 3x + 3 = 0 --> 3x = -3 so x= -3/3 = -1If: x+4 = 0 ---> x = -4x = -1 or -4Hope that helped!

gsethunath

06 May 2017

3x(x+4)+3(x+4)=0(3x+3)(x+4)=03(x+1)(x+4)=0x+1=0 and x+4=0x=-1 or x=-4

sudarsan

14 May 2017

Let's solve your equation step-by-step.3x(x+4)+3(x+4)=0Step 1: Simplify both sides of the equation3x2+15x+12=0Step 2: Factor left side of equation.3(x+1)(x+4)=0Step 3: Set factors equal to 0.x+1=0 or x+4=0ans:x=−1 or x=−4

amitesh

09 June 2017

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