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24-04-2020
Mathematics

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if the area rectangle below us 39 square feet find the x value

if the area rectangle below us 39 square feet find the x value class=

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deqdinside deqdinside

24-04-2020

Answer:

x=5 and x=-11

Step-by-step explanation:

(x-2)(x+8)=39

[tex]x^2+6x-16=39[/tex]

Subtract 39 from both sides

[tex]x^2+6x-55=0[/tex]

Factor:

(x-5)(x+11)=0

Set factors to 0.

x-5 =0

x+11 =0

x=5, x=-11

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