Asked by Mark
what is the value of z so that -9 and 9 are both solutions of x^2+z=103?
Answers
Answered by
Reiny
x^2 = 103 - z
if ±9 is the solution for the above, we must have had
x^2 = 81
then 103 - z = 81
solve for z
if ±9 is the solution for the above, we must have had
x^2 = 81
then 103 - z = 81
solve for z
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