Question

if 3a+b=7 and 3a-b=5 . Find the value
of 18^2+2b^2​

Answer 1

hope this Will help you

Answer 2

subtract equation first and second

we get

2b= 2

b=1

put b=1 equal to 1 in equation first

we get

3a+1=7

a=2

then value of 18² + 2b²= 324+2(1)²=326

1