Question

Me ajudem por favor
Efetue as operações:
A-(3+√2).(5-3√2)
B-(5-2√3)²
C-(2√5-4√7).(√5+2√7)
D-(3+√2)²
E-(4-√5)²

Answer 1

a) 9 - 4 x raiz 2
b) 37 - 20 x raiz3
c) - 46
d) 11+ 6 x raiz 2
E) 21 - 8 x raiz 5

Answer 2

vamos lá...

A)
(3+√2).(5-3√2)=
15-9√2+5√2-3√2²=
15-4√2-3(2)=
15-4√2-6=
9-4√2

B)
(5-2√3)²=(5-2√3)(5-2√3)=
25-10√3-10√3+4√3²=
25-20√3+4(3)=
25-20√3+12=
37-20√3

C)
(2√5-4√7)(√5+2√7)=
2√5²+4√35-4√35-8√7²=
2(5)-8(7)=
10-56=-46

D)
(3+√2)²=(3+√2)(3+√2)=
9+3√2+3√2+√2²=
9+6√2+2=
11+6√2

E)
(4-√5)²=(4-√5)(4-√5)=
16-4√5-4√5+√5²=
16-8√5+5=
21-8√5