Multiply and simplify if possible

(5−√2)(4+√2)

To multiply (5−√2)(4+√2), we need to apply the distributive property:

(5)(4) + (5)(√2) - (√2)(4) - (√2)(√2)
= 20 + 5√2 - 4√2 - 2
= 18 + √2

Therefore, (5−√2)(4+√2) simplifies to 18 + √2.