# Quadratic Equations Practice Problem 2

## Which of the following is a quadratic equation?

A. x³ + 2x + 1 = x² + 3

B. – 2x = (5 – x) (2x – $$\frac{2}{5}$$)

C. ( k + 1 )x² +$$\frac{3}{2}$$x=7, where k = -1

D. x³x² = (x³)

Option A – has no real roots

Option B is independent of term x²

Option C is also independent of term x² for k= -1

Option D implies

x² =1

x= ±1

Hence answer is Option D

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vee kwari

how do we state the nature of quadratics

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Karthik

A polynomial can have real numbers as zero(ie rational and irrational)to decide it’s nature we can use the relationship between the coefficients and zero (by comparing sum and product of zeroes)

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Vikas

HI

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HELLOOO

Hi

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Bhargav

Hi

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If d 0 – real & distinct roots
d =0 – real & equal roots ….