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

asked Jul 25, 2021 235k views

1 vote

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

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4 votes

(x - 5)(x + 7) = 3 x + 21

(x - 5)(x + 7) = 3(x + 7)

$(x - 5)(x + 7) - 3(x + 7) = 0 \\$

(x + 7)(x - 5 - 3) = 0

(x + 7)(x - 8) = 0

$x + 7 = 0 \\ x = - 7$

$x - 8 = 0 \\ x = 8$

Rich Pauloo answered Jul 31, 2021

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