Question

(a-b+c) (a+b-c) .find the product with help of formulae .​

Answer 1

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

wkt,,

(x+y) (x-y) =x^2-y^2

apply this

we get

a^2-(b-c)^2

a^2-(b^2+c^2-2bc)

a^2-b^2-c^2+2bc