ab=72 and a+b=22?

3 ⤊

2007-08-20 18:13:48 · 4 answers · asked by xxbabycheekzix 1 in Science & Mathematics ➔ Mathematics

a(22 - a) = 72
22a - a² = 72
a² - 22a + 72 = 0
(a - 4) (a - 18) = 0
a = 4 , a = 18
b = 18 , b = 4

2007-08-20 19:52:41 · answer #1 · answered by Como 7 · 2⤊ 0⤋

18 and 4.

2007-08-20 18:22:22 · answer #2 · answered by kara s 3 · 0⤊ 0⤋

s= a+b = 22
p=ab=72
viet theory: X^2 - 22X + 72 =0 <=>X=18 or X=4

2007-08-20 23:14:00 · answer #3 · answered by Trần Hoài Vũ 2 · 0⤊ 2⤋

Two solutions:
a=18, b=4
a=4, b=18

2007-08-20 18:23:23 · answer #4 · answered by Jerry 2 · 1⤊ 1⤋