7(3) + 8(4) x 2
21 + 32 x 2
43 x 2
86
The final answer is 86.
Clearly, there are some signs missing. So let's try the four possibilities for the second terms: 1. + and + 3a + 4b = 7a + 4b Subtract 4b from each side: 3a = 7a Subtract 3a from each side: 0 = 4a Answer : a = 0, b indeterminate (ie can have any vaue). 2. + and - 3a + 4b = 7a - 4b Subtract 4b from each side: 3a = 7a - 8b Subtract 7a from each side: -4a = -8b or 4a = 8b Answer: a = 2b 3. - and - 3a - 4b = 7a - 4b Add 4b to each side: 3a = 7a Subtract 3a from each side: 0 = 4a Answer : a = 0, b indeterminate (ie can have any vaue). 4. - and + 3a - 4b = 7a + 4b Add 4b to each side: 3a = 7a + 8b Subtract 7a from each side: -4a = 8b or 4a = -8b Answer: a = -2b Can't do better than that with the information available.
8b = e - 12n, possibly.
8b = -65 so b = -8.125
It is: a(7a-8b)
6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b
That's an equation in which b = -1
One of the factors is 3x + 8b. The other is 9x^2 -24xb + 64b^2
8b + 11 - 3b = 2b + 2 5b + 11 = 2b + 2 5b - 2b = 2 - 11 3b = -9 b = -3
7b + 16 = 5b + 247b - 5b = 24 - 162b = 8b = 4
b^2 + 8b + 7 factors to (b + 7)(b + 1)
8b
13b !