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28-03-2018
Mathematics

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What is the value of z so that -9 and 9 are both solutions of x2 + x = 103?

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calculista calculista

28-03-2018

the correct question in the attached figure

we know that
If the solutions are -9 and 9, then we can use this to form our equation:
(x - 9)(x + 9) = 0
x² - 81 = 0
so...
x² + z - 103 = x² -81
z - 103 = -81
z = -81 + 103
z = 22

the answer is the option C) 22

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