Question

(X+4)(x-5)using algebraic identities

Answer 1

Answer:

Using identity-(x+a) ( x+b)=x^2+(a+b)+x+(ab)

Step-by-step explanation:

=x^2+(4+- 5)+x(4×-5)

=x^2-1+x-20

=x^3+21 ANSWER

Answer 2

Answer:

by using identity (x+a) (x+b) =x²+(a+b)x+(ab)

=(x)²+(4+(-5))x+4×(-5)

=x²+(-1)x+(-20)

=x²-1x-20 ans