09-06-2020
Mathematics

contestada

[tex] {x}^{2} - 4x = 21[/tex]
what are the x intercepts?

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BrainlyHero BrainlyHero

09-06-2020

Answer:

x² - 4x = 21

x² - 4x - 21 = 0

x² - 7x + 3x - 21 = 0

x( x - 7 ) + 3 ( x - 7 ) = 0

( x + 3 ) ( x - 7 ) = 0

x + 3 = 0 and x - 7 = 0

x = -3 and x = 7

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