Answer:
4x(3x+7)
Step-by-step explanation:
![12x^2+28x\\12xx+28x\\\\4\cdot \:3xx+4\cdot \:7x\\4x\left(3x+7\right)](https://tex.z-dn.net/?f=12x%5E2%2B28x%5C%5C12xx%2B28x%5C%5C%5C%5C4%5Ccdot%20%5C%3A3xx%2B4%5Ccdot%20%5C%3A7x%5C%5C4x%5Cleft%283x%2B7%5Cright%29)
Let the number be x
Equation:
12 + 5x = -3
Answer: The equation is 12 + 5x = -3
Solve it:
5x = -3 - 12
5x = -15
x = -15 ÷ 5
x = -3
Answer: The number is -3.
Kx-3y=k
y=4x+1 ( we will put it in 1st equation )
kx - 3 (4x+1)=k
kx - 12 x - 3 =k
kx - 12 x = k+3
x(k-12) = k+3
x=
![\frac{k+3}{k-12}](https://tex.z-dn.net/?f=%20%5Cfrac%7Bk%2B3%7D%7Bk-12%7D%20)
Also y=
![\frac{5k}{k-12}](https://tex.z-dn.net/?f=%20%5Cfrac%7B5k%7D%7Bk-12%7D%20)
We can not divide with zero.
k-12=0
k=12For k= 12 equations have no solutions.
Answer:
m=2
Step-by-step explanation:
STEP 1 : m+0.6=2.6
move constant to the right-hand side and change it's sign m=2.6-0.6
STEP 1: m=2.6-0.6
subtract the numbers m=2