Question

Simplity : (5+√15) (5-√15)​

Answer 1

$(5 + \sqrt{15} )(5 - \sqrt{15} ) = 25 - 5 \sqrt{15} + 5 \sqrt{25} - { (\sqrt{15} })^{2} = 25 - 15 = 10$

Answer 2

используем формулу разности квадратов, получим

(5+√15) (5-√15)​= 5²-(√15)​²=25-15=10

Answer 3

To simplify the expression $(5+\sqrt{15})(5-\sqrt{15})$, we can use the difference of squares formula, which states that $a^2 - b^2 = (a + b)(a - b)$. In this case, $a = 5$ and $b = \sqrt{15}$. Applying the formula:

$(5+\sqrt{15})(5-\sqrt{15}) = 5^2 - (\sqrt{15})^2 = 25 - 15 = 10$.

So, the simplified result of the expression is $10$.