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08-10-2020
Mathematics

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Which of the following is a solution of (x - 5)(x + 7) = 3x + 21
0
45
8
5

Which of the following is a solution of x 5x 7 3x 21 0 45 8 5 class=

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hnori22003 hnori22003

08-10-2020

[tex](x - 5)(x + 7) = 3 x + 21[/tex]

[tex](x - 5)(x + 7) = 3(x + 7)[/tex]

[tex](x - 5)(x + 7) - 3(x + 7) = 0 \\ [/tex]

[tex](x + 7)(x - 5 - 3) = 0[/tex]

[tex](x + 7)(x - 8) = 0[/tex]

[tex]x + 7 = 0 \\ x = - 7[/tex]

Or

[tex]x - 8 = 0 \\ x = 8[/tex]

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