Mathematical formulas commonly used in junior high school of Zhejiang Education Publishing House - Training Enrollment Network

Mathematical formulas commonly used in junior high school of Zhejiang Education Publishing House

a2-b2=(a+b)(a-b)

Solution of quadratic equation in one variable -b+√(b2-4ac)/2a

discriminant

B2-4ac=0 Note: This equation has two equal real roots.

B2-4ac >0 Note: The equation has two unequal real roots.

B2-4ac & lt； Note: the equation has no real root.

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