Using the FOIL method-5 × -5 = 25-5 × -√3 = +5√3-√3 × -5 = +5√3-√3 × -√3 = +3so the answer is 28 +10√3
(-5-√3)² = (-5-√3)² . (-5-√3)² = (-5)² - (-5).√3 - (-5).√3 + (√3)² = 25 + 5√3 + 5√3 + 3 = 25 + 3 + 10√3 =28 + 10√3 =Simplify:2(14 + 5√3)
