Question

(x+3)^2- (x + 2) ^2 = 9 a quadratic equation? Justify​

Answer 1

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( x + 3 )² - ( x + 2 )² = 9

( x + 3 )( x + 3 ) - ( x + 2 ) ( x + 2 ) = 9

( x² + 3x + 3x + 9 ) - ( x² + 2x + 2x + 4 ) = 9

( x² + 6x + 9 ) - x² - 4x - 4 = 9

2x + 5 = 9

2x = 9 - 4

x = 5 / 2