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The area of a rectangular painting is given by the trinomial x2 + 4x - 21. What are the possible dimensions of the painting? Use factoring.

Respuesta :

irspow
To find the dimensions you can just factor the equation...

x^2+4x-21

x^2-3x+7x-21

x(x-3)+7(x-3)

(x+7)(x-3) and this is equal to LW or WL

And note that x>3 for any possible solution.

Answer:

[tex](x+7)\text{ and } (x-3)[/tex]

Step-by-step explanation:

We have been given an expression [tex]x^{2}+4x-21[/tex] that represents area of a rectangular painting. We are asked to find the possible dimensions of the painting using factorization.

We will factor our quadratic expression by splitting the middle term.

[tex]x^{2}+4x-21[/tex]

[tex]x^{2}+7x-3x-21[/tex]

[tex]x(x+7)-3(x+7)[/tex]

[tex](x+7)(x-3)[/tex]

Therefore, the possible dimensions of the painting are [tex](x+7)\text{ and } (x-3)[/tex].

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