Hello, shuping!

Yes, multiply it out . . .If you have an equation like: 3x-7) ^2" alt="(x-2)^2 +(2x-3) ^2 \:= \3x-7) ^2" />

is there any way to find the value of ?

We have: .

. . which simplifies to: .

. . which factors: .

. . and has roots: .