Question

(x+5)(x+4) find the product by suitable identity ​

Answer 1

${\sf{{\blue{Answer}}}}$

$\sf\:(x+5)(x+4)$

$\sf➞\:x(x+4)+5(x+4)$

$\sf➞\:x^{2}+4x+5x+20$

$\sf➞\:x^{2}+9x+20$

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Happy Solving !¡

Answer 2

Answer:

x^2+9x+20

Step-by-step explanation:

(x+a)(x+b)=x^2+(a+b)x+ab

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

=x^2+9x+20

x^2+4x+5x+20=0

x(x+4)+5(x+4)=0

(x+5)(x+4)=0

x+5=0. &. x+4=0

x=-5. &. x=-4