You do not need to transpose anything to get the formula for the area of a trapezium! (I need the transpose the formula so a is the subject thank you)
You can't solve a formula with no equals sign
Please clarify what you want to "solve". There are several operations you can do with matrices, such as add them, multiply them, transpose them, etc.
Solve using the quadratic formula
C= pi * D This is the formula for circumference.
te formulae is a half[a plus b]height
Quadratic equation formula
Not sure about the original formula, but one that works is b = a/(2c + 1)
If you can't factor it easily, use the quadratic formula.