Hallo anonymous!
a times b equals -8. a plus b equals 7. what is a and b?
a * b = - 8
a + b = 7
a = - 8 / b
a = 7 - b
- 8 / b = 7 - b
- 8 = 7b - b²
b² - 7b - 8 = 0
b1;2 = - (p/2) ±√((p/2)² -q)
b1;2 = 3,5 ±√ (3,5² + 8)
b1;2 = 3,5 ±√ 20,25 = 3,5 ± 4,5
b1 = 8
b2 = -1
a1;2 = 7 - b
a1 = -1
a2 = 8
test :
a1 * b1 = - 8
-1 * 8 = - 8 okey
a1 + b1 = 7
-1 + 8 = 7 okey
a2 * b2 = - 8
8 * (- 1) = - 8 okey
a2 + b2 = 7
8 + (-1) = 7 okey
greetings :- )