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2008.3. ax² + c = 0

Write the correct answer!

What b value should be, so that equation ax^2+(b^2-(18\times 4-513))x+c=0 would be ax^2+c=0 as a>0? (If all numbers fit, type R, if not type U)
b=±
Grade:
8
Subject
Algebra
Theme
Quadratic equation
Subtheme
ax² + c = 0

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