pammy13 pammy13

22-03-2020
Mathematics

contestada

For the function f (x) = x^2 - 2x - 8, find the two points x when f (x) =7

Respuesta :

Wallind11 Wallind11

22-03-2020

Step-by-step explanation:

[tex] {x}^{2} - 2x - 8 = 7[/tex]

[tex] {x}^{2} - 2x - 8 - 7 = 0[/tex]

[tex] {x}^{2} - 2x - 15 = 0[/tex]

[tex] {x}^{2} - 5x + 3x - 15 = 0[/tex]

[tex]x(x - 5) + 3(x - 5) = 0[/tex]

[tex](x - 5)(x + 3) = 0[/tex]

[tex]x = 5 \: \: or \: \: x = - 3[/tex]

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