Question

Determine a e b de modo que:

(a² - 7a ,3b) = (-12,5b - 4)

Answer 1

a² -7a = -12
a² -7a +12 = 0
∆= 49-48=1
a= -b±√∆/2a
a = 7±1/2
a' = 7+1/2 = 4 ✓
a" = 7-1/2 = 3 ✓

3b = 5b-4
3b -5b = -4
-2b = -4
b = 2 ✓