1.
A. Solve:
9 - 5 = (8 - 3) x 2 + 6=
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Answer:
x in (-oo:+oo)
6-((5/(8-3))*x^2)+9 = 0
6-5*(8-3)^-1*x^2+9 = 0
-1*x^2 = -15 // : -1
x^2 = 15
x^2 = 15 // ^ 1/2
abs(x) = 15^(1/2)
x = 15^(1/2) or x = -15^(1/2)
x in { 15^(1/2), -15^(1/2) }
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