Question

If A =a²+ 4 b²- 5ab, B= -2 a² + b²- ab + a and C=a ²– 2ab + b², find A + B – C.​

Answer 1

Answer:

-a²+4b²-4ab

Step-by-step explanation:

a²+4b²-5ab+(-2a²)+b²-ab-(a²-2ab+b²)

-a²+5b²-6ab-a²+2ab-b²

-2a²+4b²-4ab