Answer:
no
Step-by-step explanation:
8*10=80, 1*10=10
80+10=90
8*11=88
88 does not equal 90 so no
Answer:
a negative number;
a number that can't be a square root;
a multiple of 1,2,4,-1,-2,-4;
and other things that don't come to my mind at the moment :]
You would have to do it two times, one being negative and one being positive.
4x + 1 < 5
-1 -1
4x < 4
x < 1
4x - 1 < 5
+1 +1
4x < 6
x < 1.5
So the answer would be x<1 and x<1.5
I hope this helps!