Solve for C please.
Using factorization
2007-11-08 12:18:31 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
8•c² - 14•c - 15 = 0
or
(2c - 5)(4c + 3) = 0
to get 0 on the right, either
(2c - 5) = 0
or
(4c + 3) = 0
so:
(2c - 5) = 0
or
2c = 5
or
c = 5÷2 = 5/2 = 2.5
and
(4c + 3) = 0
4c = -3
c = -3÷4 = -3/4 = -0.75
┏━━━━━━━━┓
┃✓ c = 5/2 = +2.5 ┃
┃┄┄┄┄┄┄ and ┄┄┄┄┄┃
┃✓c = -3/4 = -0.75┃
┗━━━━━━━━┛
2007-11-08 12:24:09 · answer #1 · answered by Ms. M 3 · 0⤊ 0⤋
8c^2 - 14c - 15 = 0
8c^2 - 20c + 6c - 15 = 0
4c (2c - 5) + 3(2c - 5) = 0
(2c - 5) (4c + 3) = 0
c1 = 5/2
c2 = - 3/4
2007-11-08 20:28:07 · answer #2 · answered by achain 5 · 0⤊ 0⤋
8c^2-14c-15=0
(4c+3)(2c-5)=0
c=3/4 or -5/2
2007-11-08 20:23:37 · answer #3 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋