SOLUTION: solve: x^2+4x=3 a. -2.3, 0.3 b. -4.6, 0.6 c. -5.3, 1.3 d. -5.4, 0.4

Algebra ->  Radicals -> SOLUTION: solve: x^2+4x=3 a. -2.3, 0.3 b. -4.6, 0.6 c. -5.3, 1.3 d. -5.4, 0.4      Log On


   

Question 136930: solve: x^2+4x=3

a. -2.3, 0.3
b. -4.6, 0.6
c. -5.3, 1.3
d. -5.4, 0.4
Answer by dolly(163) About Me  (Show Source):
You can put this solution on YOUR website!
Hi,
The given equation is x^2+4x=3
which can be written as x^2+4x-3=0
Using the quadratic formula here,
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x+=+%28-4+%2B-+sqrt%28+4%5E2-4%2A1%2A%28-3%29+%29%29%2F%282%29+

x+=+%28-4+%2B-+sqrt%28+16%2B12+%29%29%2F%282%29+
x+=+%28-4+%2B-+sqrt%28+28%29%29%2F%282%29+
==> x = -4.6, 0.6

Choice is (b)
good luck!!!
dolly