Question

i) (a + b + c)(a + b -c)​

Answer 1

Answer:

a2+b2-c2+2ab

Step-by-step explanation:

(a+b+c)(a+b-c)

=a2+ab-ac+ab+b2-bc+ac+bc-c2

=a2+b2-c2+2ab

Answer 2

Answer:

${a}^{2} + {b}^{2} - {c}^{2}$