If a+b=7 and ab=12, find the value of a²+b².

1

If x+ =3, then find the value of x²+.

2

If x+ =3, then find the value of x⁶+.

4

If a-b=5 and ab=12, find the value of a²+b².

5

If x- =, then write the value of 4x²+.