Question

7+3√2* 7-3√2
and the solution for this ques is 49-18
I didn't understand pls Anyone explain​

Answer 1

Answer:

32.4558441227

Step-by-step explanation:

−3

2

×

7−3

2

7−3

2

UsingIdentities:

(a+b).(a−b)=a

2

−b

2

(a−b).(a−b)=(a−b)

2

=

(7)

2

−(3

2

)

2

(7−3

2

)

2

AgainUsingIdentity:(a−b)

2

=a

2

+b

2

−2ab

=

49−9×2

(7)

2

+(3

2

)

2

−(2)(7)3

2

=

49−18

49+9×2−42

2

=

31

49+18−42

2

=

31

67−42

2