Question

Simplify

(x+4) (x-4) - (x + 1)(x-1) + 15​

Answer 1

Answer:

$1.Use \:  Difference \: of \: Squares: \\ {a}^{2} − {b}^{2} =(a+b)(a−b). \\ x² - 4²- (x²-1) (x-1) +15 \\ 2.Use \: Difference \: of \: Squares: \\ {a}^{2} − {b}^{2} =(a+b)(a−b). \\ x²-4²-(x²-) +15 \\ 3.Remove \: parentheses \\ x²−4²−x²+1+15 \\ 4. Simplify \: 4² \: to \: 16 \\ x²−16−x²+1+15 \\ 5.Collect \: like \: terms. \\ (x²−x²)+(−16+1+15) \\ 6.Simplify \\ 0$

Explanation:

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