can anyone help with this problem? N^2 + n = 72?

4 ⤊

2007-11-04 13:29:47 · 5 answers · asked by jokersrage2 1 in Science & Mathematics ➔ Mathematics

n² + n - 72 = 0
(n + 9) (n - 8) = 0
n = - 9 , n = 8

2007-11-04 21:43:41 · answer #1 · answered by Como 7 · 2⤊ 1⤋

8*9=72

2007-11-04 13:33:51 · answer #2 · answered by DWRead 7 · 0⤊ 0⤋

n^2 + n - 72=0
(n+9)(n-8) = 0

n + 9 = 0 and n - 8 = 0
n = -9 and n = 8

2007-11-04 13:34:50 · answer #3 · answered by Ms. Exxclusive 5 · 1⤊ 0⤋

n^2 + n = 72
n*(n+1) = 72 = 8*9
therefore
n = 8
or
n = -9

2007-11-04 13:34:54 · answer #4 · answered by Anonymous · 1⤊ 0⤋

n^2+n-72=0
n^2+9n-8n-72=0
n(n+9)-8(n+9)=0
(n-8) (n+9)=0
n=8; n=(-9)

2007-11-04 13:37:01 · answer #5 · answered by Anonymous · 0⤊ 0⤋