Question

(x+5)(x+4) find with a suitable identity and what is its formula to find it

Answer 1

hope this might help you

Answer 2

hi mayank solution :- using identity :- ( x plus a ) ( x plus b ) -- x^2 plus xb plus xa plus ab then, a.t.identity ; x^2 plus 4x plus 5x plus 5x4 then, x^2 plus 9x plus 20