Question

(x+3) (x+4) solve by using identities


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Answer 1

Answer:

Hii,

Step-by-step explanation:

By using identity:- (x + a)(x + b) = x² + (a + b)x + ab

so, a = 3 & b = 4

x² + (3 + 4)x + 3 x 4

x² + 7x + 12

Here Is The Answer

Answer 2

In accordance with the information provided in the question,

We have find the value of the supplied expression in the above question.

Given the data in question multiply (x+3) (x+4)

We have find the value of given expression

We have use the identity

$(x+a)(x+b)=x^{2} +ax+bx+ab\\ =x^{2} +(a+b)x+ab$

We know that ,

$(a+b)(a-b)=a^{2} -b^{2}$

Where $a=3$ and $b=4$

now putting the value of given identity

$(x+3)(x+4)=x^{2} +(3+4)x+(3\times4)\\=x^{2} +7x+12$

Hence the required value will be $(x+3)(x+4)=x^{2} +7x+12$.