Question

(a+5) by (a+4)

MULTIPLY:

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Answer 1

Answer:

(a+5)(a+4) = a²+9a+20

Step-by-step explanation:

(a+5)(a+4)

= a²+(5+4)a+(5×4)

/* By algebraic identity:

(x+m)(x+n) = x²+(m+n)x+mn */

= a²+9a+20

Therefore,

(a+5)(a+4) = a²+9a+20

•••♪

Answer 2

$\huge\star{\bf{\underline{\underline{\blue{Answer}}}}}\star$

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We have a formula for this problem.

$\large{\tt{\green{Formula\implies (x+a)(x+b) = x^2+ (a+b)x+(ab)}}}$

we have been given that

x= a

a=5

b=4

So by applying the formula Above

(a+5)(a+4)=a²+(5+4)a+(4 x 5)

$\implies$ $\large\bold{\boxed{a^2 + 9a + 20}}$

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