malachijwilson5
05.05.2020 •
Mathematics
Which is a solution to the equation?
(x -2)(x+5)=18
x=-10
x=-7
x=-4
x=-2
Solved
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Ответ:
x = -7
Step-by-step explanation:
Steps of solution:
(x -2)(x+5)=18x² + 5x - 2x -10 = 18x² + 3x - 10 - 18 = 0x² + 3x -28 = 0x² - 4x + 7x - 28 = 0x(x - 4) + 7(x - 4) = 0(x - 4)(x+7) = 0x - 4 = 0 ⇒ x = 4x + 7 = 0 ⇒ x = -7The roots are:
4 and - 7Correct answer option is:
-7Ответ:
Step-by-step explanation:
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