Find and explain the error for me please 4x+6=2x+12

4x+6=2x+12
2x =2x

6x+6=12
-6 -6

x=1

whats the error

which of the following sets of data would produce the largest value for an independent-measures t statistic? the two sample means are 10 and 20 with variances of 20 and 25 the two sample means are 10 and 20 with variances of 120 and 125 the two sample means are 10 and 12 with sample variances of 20 and 25 the two sample means are 10 and 12 with variances of 120 and 125

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b

I’ve been trying all day to figure this puzzle out. i need the work for it aswell. it is a factoring polynomials tarsia. the image is below.