Question

Se A=a -3B,então ache o valor de A^2

Answer 1

A = a-3B
A² = (a-3b)²
A² = a² -6ba + 3²b²
A² = a² -6ba + 9b²

Answer 2

(a-3b).(a-3b)= A^2 -3AB-3AB+9B^2

A^2-6AB+9B^2