Does anyone know how to do this?
2007-04-17 06:15:54 · 8 answers · asked by ♥♪ Zee ☆♫ 4 in Science & Mathematics ➔ Mathematics
(3x + 2)² = 12
(3x + 2)(3x + 2) = 12
9x² + 6x + 6x + 4 = 12
9x² + 12x - 8 = 0
Factorize:
x = - 1∙821 367 205 and x = 0∙488 033 871
2007-04-17 06:35:46 · answer #1 · answered by Brenmore 5 · 0⤊ 0⤋
First step is to take the square root of both sides.
This leaves 3x + 2 = +or- radical 12
Subtract 2 on both sides then divide by 3 on both sides and the answer is:
x = (-2 +or- radical 12)/3
2007-04-17 13:25:35 · answer #2 · answered by Brian S 2 · 0⤊ 1⤋
(3x + 2).(3x + 2) = 12
9x² + 12x + 4 = 12
9x² + 12x - 8 = 0
x = [-12 ± â(144 + 288)] /18
x = [-12 ± â432] / 18
x = 0.488, x = - 1.82
2007-04-17 13:23:24 · answer #3 · answered by Como 7 · 1⤊ 1⤋
(3x + 2)^2 =12
(3x + 2)(3x+2) =12
9x^2 + 6x +6x + 4 =12
9x^2 + 12x +4=12
9x^2 + 12x - 8 =0
Using the quadratic formula x= 0.488 or --1.821.
2007-04-17 13:23:00 · answer #4 · answered by The exclamation mark 6 · 1⤊ 1⤋
(3x+2)(3x+2) = 12
9x^2 +12x + 4 = 12
9x^2 +12x - 8 = 0
Then use quadratic to solve for x.
(-b +/- SQRT( b^2 - 4(a)(c) ) ) / 2(a)
(-12 +/- SQRT(432) )/ 18
x=0.488 and -1.821
2007-04-17 13:26:32 · answer #5 · answered by Anonymous · 0⤊ 0⤋
Make it easy on yourself and SqrRoot both sides then solve for X.
2007-04-17 13:31:58 · answer #6 · answered by AL 1 · 0⤊ 0⤋
sqrt12 =3.464
3.464-2=1.464/3= .488
2007-04-17 13:42:02 · answer #7 · answered by The Central Scruitinizer 2 · 0⤊ 0⤋
yes i know how to do it and the answer is 0.5 give or take .01
2007-04-17 13:24:33 · answer #8 · answered by junkie 2 · 0⤊ 2⤋