Aa) (√7 - √3)^= (√7 - √3)(√7 - √3= (√7)^2 - 2√7√3 + (√3)^= 7 - 2√21 + = 10 - 2√21
b) (√10 - 8)(√10 + 8= (√10)^2 - 8^= 10 - 6= -54
B2√50 - 3√8 + √= 2√(25 2) - 3√(4 2) + √= 2(5√2) - 3(2√2) + √= 10√2 - 6√2 + √= 5√2
A
a) (√7 - √3)^
= (√7 - √3)(√7 - √3
= (√7)^2 - 2√7√3 + (√3)^
= 7 - 2√21 +
= 10 - 2√21
b) (√10 - 8)(√10 + 8
= (√10)^2 - 8^
= 10 - 6
= -54
B
2√50 - 3√8 + √
= 2√(25 2) - 3√(4 2) + √
= 2(5√2) - 3(2√2) + √
= 10√2 - 6√2 + √
= 5√2