Question

solve this worksheet because I forgot to solve it and today's my lesson and oral of it​

Answer 1

Answer:

thank you my lovely guys

Answer 2

1.(a+b)(a-b)=a²-b²

√3²-√7²

=3-7

= -4

2.1/7+3√3

=1×7-3√3/(7+3√3)×(7-3√3)

=7-3√3/7²-(3√3)²

=7-3√3/49-27

7-3√3/22

3.(4+√3)×(4+√3)/(4-√3)(4+√3)=x+y√3

=>4²+√3²+2×4×√3/4²-√3²

=>16+3+8√3/16-3

=>19+8√3/13

therefore x=19/13 and y=8