a+b=3,ab=-4,
{（a+1）²—2a} {（b+1)²—2b}
=（a²+2a+1-2a)(b²+2b+1-2b)
=(a²+1)(b²+1)
=(ab)²+(a²+b²)+1
=(-4)²+(a+b)²-2ab+1
=16+3²-2×(-4)+1
=34