Question

Alpha and beta are roots of y square - 2y - 7 is equal to zero then find alpha square plus beta square and alpha cube + beta cube

Answer 1

USE THE FORMULA

$( - b \frac{ + }{} \sqrt{b {}^{2} - 4ac } ) \div 2a$

FIND OUT THE ROOTS OF THE EQUATION AND LET ONE OF HE ROOTS BE ALPHA AND OTHER ROOT BE BETA.

FIND OUT ALPHA CUBE PLUS BETA CUBE.

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