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