Question

Which of the following equations is quadratic ?
(1) x²+2x+11=0
(2) x²-2x+5=x²
(3) (x+2)²=2x²

Answer 1

Hi ,

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If the Equation degree is 2 then it is

called quadratic equation.

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1 ) x² + 2x + 11 = 0

degree = 2

Therefore it is a quadratic equation.

2 ) x² - 2x + 5 = x²

x² - 2x + 5 - x² = 0

-2x + 5 = 0

degree = 0

linear equation.

3 ) ( x + 2 )² = 2x²

x² + 4x + 4 = 2x²

x² - 2x² + 4x + 4 = 0

- x² + 4x + 4 = 0

degree = 2

Therefore , it is a quadratic equation.

( 1 ) and ( 2 ) are quadratic equations.

I hope this helps you.

: )

Answer 2

Answer:

1 and 3 are the quadratic equations

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