Trending News
Promoted
solve for r...10 easy points!!!!?
r^2+3r=2 The solutions are r=????
3 Answers
Relevance
- 1 decade agoFavorite Answer
r^2+3r-2 = 0
Factorize the equation. then
(r+1)(r-3) = 0
Therefore, r = -1 & 3
- flyingagentLv 41 decade ago
r^2 + 3r - 2 = 0
for any quadratic equation of the form
ax^2 +bx + c =0
x = -b +- sqrt (b^2 - 4 * a * c)
------------------------------------------
2 * a
Solving this, by the above formula, we get
r = -3 +- sqrt (9-4*1*-2)
------------------------------------
2
= [-3 +- sqrt (17)]/2
=[ -3 +- 4.12]/2
= -7.12/2 or 1.12/2
=- 3.56 and 0.56
Still have questions? Get your answers by asking now.