Mathematics
Find which of the following equations are quadratic :
7x3 - 2x2 + 10 = (2x - 5)2
Quadratic Equations
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Answer
7x3 - 2x2 + 10 = (2x - 5)2
⇒ 7x3 - 2x2 + 10 = 4x2 + 25 - 20x
⇒ 7x3 - 2x2 - 4x2 + 10 - 25 + 20x = 0
⇒ 7x3 - 6x2 - 15 + 20x = 0 which is not of the form ax2 + bx + c = 0.
∴ Given equation is not a quadratic equation.
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