Question

Select all of the following that are quadratic equations. 5 x 2+ 15 x = 0 6 x - 1 = 4 x + 7 x 2 - 4 x = 4 x + 7 2 x - 1 = 0 3 x 2 + 5 x - 7 = 0 x 3 - 2 x 2 + 1 = 0

Answer 1

• Options A, C and E

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Quadratic equation has the form of:

• ax² + bx + c = 0

Analyze the given equations and see which has the same form:

• A) 5x² + 15 x = 0, Yes, quadratic equation;
• B) 6 x - 1 = 4, No, it is a linear equation;
• C) x + 7x² - 4 x = 4, Yes, quadratic equation;
• D) x + 72x - 1 = 0, No, it is a linear equation
• E) 3x² + 5x - 7 = 0, Yes, quadratic equation;
• F) x³ - 2x² + 1 = 0, No, it is cubic equation