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2007.3. ax² + c = 0

Write the correct answer!

What should be b value, so that the general type of equation 3x^2+(b-7)x+c=0 was ax^2+c=0 taking into consideration that a>0? (If all numbers fit, write R, if no one fits, write U)
b=
Grade:
8
Subject
Algebra
Theme
Quadratic equation
Subtheme
ax² + c = 0

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