Search
Ask a question
0

Solve the equation

Solve the equation.

 

(2r + 1 )( r -2 ) = - (3r -6 )

5 Answers by Expert Tutors

Tutors, sign in to answer this question.
Nataliya D. | Patient and effective tutor for your most difficult subject.Patient and effective tutor for your mos...
1

I like answers above, but want to give another approach, this is algebra any way.
(2r + 1)(r - 2) = - (3r - 6)
(2r + 1)(r - 2) + (3r - 6) = 0
(2r + 1)(r - 2) + 3(r - 2) = 0 , factor out (r - 2)
(r - 2)(2r + 1 + 3) = 0
(r - 2)(2r + 4) = 0 , factor out 2
2(r - 2)(r + 2) = 0
Product equal zero if at least one factor equal zero.
r1,2 = ±2

Ralph L. | Algebra I, II, Visual Basic, Beginning C++ tutorAlgebra I, II, Visual Basic, Beginning C...
4.0 4.0 (1 lesson ratings) (1)
1

(2r + 1)(r - 2) = -(3r - 6)

2r2 - 4r + r - 2 = -3r + 6

2r2 - 3r - 2 = -3r + 6

2r2 - 3r + 3r - 2 - 6 = 0

2r2 - 8 = 0

(2r2 - 8) / 2 = 0 / 2

r2 - 4 = 0

r2 = 4

r = ± 2

 

 

Robert J. | Certified High School AP Calculus and Physics TeacherCertified High School AP Calculus and Ph...
4.6 4.6 (13 lesson ratings) (13)
1

Expand and simplify,

2r2 - 3r - 2 = -3r + 6

r2 = 4

r = +/- 2 <==Answer

Asok B. | Ph. D in Biochemistry, willing to teach Chemistry, Biochemistry, MathPh. D in Biochemistry, willing to teach ...
4.7 4.7 (18 lesson ratings) (18)
0

(2r + 1 )( r -2 ) = - (3r -6 )

2r2+ r-4r-2 = -3r+6

2r2-3r-2=-3r+6

2r2=8

r2=4

Thus r= +2 or -2

Ryan L. | Ryan, a wiz at Math, Physics, Chemistry, Biology and EngineeringRyan, a wiz at Math, Physics, Chemistry,...
0

2r^2 + r - 4r -2 + 3r -6 = 0 = 2r^2 - 8 = (2r + 4)(r - 2)

r = 2 or -2