QUADRATIC FORMULA
2007-07-10 06:01:55 · 7 answers · asked by becks92009 1 in Science & Mathematics ➔ Mathematics
4(x + 3) + 3x = 21
4x + 12 + 3x = 21
collect like terms
7x + 12 = 21
Transpose 12
7x + 12 - 12 = 21 - 12
7x = 9
Divide both sides of the equation by 7
7x / 7 = 9 / 7
x = 9 / 7
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2007-07-10 09:58:18 · answer #1 · answered by SAMUEL D 7 · 0⤊ 0⤋
Simplify:
4(x + 3) + 3x = 21
4x + 12 + 3x = 21
7x = 9
x = 9/7
There is no need to use the quadratic formula with the stated problem.
2007-07-10 06:06:11 · answer #2 · answered by yeeeehaw 5 · 0⤊ 0⤋
4(x+3) + 3x =21
4x + 12 + 3x =21
7x + 12 =21
7x = 21-12=9
X=9/7
2007-07-10 06:11:09 · answer #3 · answered by Llama Librarian 2 · 0⤊ 0⤋
4(x+3) + 3x =21
4x + 12 + 3x =21
7x + 12 =21
7x = 21-12=9
x=9/7
2007-07-10 06:09:30 · answer #4 · answered by bigbroaddict 1 · 0⤊ 0⤋
4(x+3) + 3x =21
4x + 12 + 3x =21
7x + 12 =21
7x = 21-12=9
x=9/7
2007-07-10 06:07:44 · answer #5 · answered by Saurabh K 1 · 0⤊ 0⤋
not a quadratic - i assume u might have left the ^ out.
4x +12 + 3x = 21
7x = 21 - 12
7x = 9
x = 9/7
2007-07-10 06:07:13 · answer #6 · answered by pcreamer2000 5 · 0⤊ 0⤋
if you just want the answer it it X+ 9/7th...if you want to knwo how it is solved..then
4(x+3)= 4x + 12
then you have 4x + 12 + 3x = 21
then you have 7x + 12 = 21
then you have 7x= 9 ( you get this by subtracting 12 from each side of the = sign
then you devide both by 7, you get X = 9/7
2007-07-10 06:10:37 · answer #7 · answered by jdesertk 3 · 0⤊ 0⤋