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valentina_108 [34]
3 years ago
14

What is the value of z so that-9 and 9 are both solutions of x^2+z=103?

Mathematics
1 answer:
notka56 [123]3 years ago
8 0
If the sol'ns are -9 and 9, then we can use this to form our eq'n:
(x - 9)(x + 9) = 0
x^2 - 81 = 0
so...
x^2 + z - 103 = x^2 -81
z - 103 = -81
z = -81 + 103
z = 22
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