Question

given that 5a-3b=16 and ab=15, find the value of 25a^2+9b^2​

Answer 1

Answer:

ab=15

therefore b=15/a

therefore

5a-3(15/a)=16

5a^2-45=16a

5a^2-16a-45=0

5a^2-25a+9a-45=0

5a(a-5)+9(a-5)=0

a=5 or -5/9

if a=5

b=3

And if a=-5/9

b=-15*9/5

b=-27

now but in equation you will get the answer

Step-by-step explanation:

25(5*5)+9(3*3)

25*25+9*9

625+81

706

and now but second equation I. the same manner