Question

when ab = 20 and a+b=9 find the value of a and b ​

Answer 1

Answer:

value of a and b is 5 and 4 respectively

Answer 2

Answer:

a=5,b=9

Step-by-step explanation:

i)a+b=9

a=9-b    (i)

ii)ab=20

9-b*b=20

9b*b^2=20

0=b^2-9b+20

0=b^2-b(5+4)+20

0=b^2-5b-4b+20

0=b(b-5)-4(b-50

0=(b-5)(b-4)

Ethet         or

b-5=0        b-4=0

b=5            b=4

∴a=5,b4