Solve: x^2 +4x =3. Use a Calculator to approximate the solutions to the nearest tenth.
a). -2.3, 0.3
b). -4.6, 0.6
c). -5.3, 1.3
d).-5.4, 0.4
2007-04-14 06:06:48 · 6 answers · asked by cyberlove 1 in Science & Mathematics ➔ Mathematics
(x+2)^2 = 7
x = 02 +/-sqrt(7) = 0.6, -4.6 so (b)
2007-04-14 06:13:42 · answer #1 · answered by hustolemyname 6 · 0⤊ 0⤋
Where's the trig. For this guy, recast in linear form, x^2 + 4x - 3 = 0. Then you have several options. You can complete the square noting that
x^2 +4x + 4 = (x+2)^2.
Then (x+2)^2 -7 = 0, and x+2 = +/- sqrt(7).
Since sqrt(7) = 2.64 or so, (b) looks like the best choice.
2007-04-14 06:16:15 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
enable x be the "different" perspective. Then the 1st perspective may well be 2x-15. Complementary angles upload as much as ninety levels. So the equation reads x + (2x-15) = ninety. Simplify, 3x-15 = ninety. upload 15 to the two factors, 3x = one 0 five. Divide the two factors by using 3, x = 35. it is the smaller perspective. the 1st perspective is 2x35-15, it is fifty 5 levels. it is the bigger perspective, so "c" is the respond.
2016-10-22 03:55:47 · answer #3 · answered by Anonymous · 0⤊ 0⤋
the answer is b
use the formula: ( -b (+/-) √b^2 - 4ac)/2a
substitute the numbers and u will end up with -2 (+/-) √7
which equals the answers in b
2007-04-14 06:14:57 · answer #4 · answered by bingobet 3 · 0⤊ 0⤋
You need to pay attenion in class. And Then youll know.
-Janessa
2007-04-14 06:22:18 · answer #5 · answered by Anonymous · 0⤊ 0⤋
why don't you pay attention in school, and do your own homework?
2007-04-14 06:09:53 · answer #6 · answered by andy42s 3 · 0⤊ 0⤋