How do you simplify $(sqrt10+5)(sqrt10-5)$ ?

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Answer 1 · 2018-05-20T02:28:06

$-15$

$(sqrt10+5)(sqrt10-5)$

FOIL

$sqrt10*sqrt10 -5sqrt10 + 5sqrt10 -25$

combine like terms:

$sqrt10*sqrt10 -25$

$(sqrt10)^2 -25$

$10 -25$

$-15$

How do you simplify (sqrt10+5)(sqrt10-5)(sqrt10+5)(sqrt10-5)?