Question

$(x + 5) ( x + 4)$
​

Answer 1

Answer:

$\huge\bold\blue{ANSWER: -10}$

Answer 2

Answer:

This is similar to the identity (x+a)(x+b)=x^2+x(a+b)+ab.

Here, a=5 and b=4.

Thus, (x+5)(x+4)

=x^2+ x(5+4)+5 *4

=x^2 + 20x + 20