I think it's a^2 b^2 + 6ab + 9
You can see it’s 90
You can also see it because. A triangle is 180 degrees so
45+45=90
180-90=90
So x=90
Step-by-step explanation:
Solution file attached
The answers you could use are both the second and the forth. But mostly the fourth.
Because without place value you might put the decimal in the wrong place and that will effect the answer big time.
