Plz answer this..... Thx
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Answer:
- 450 + 90√7
b = -------------------
2
Step-by-step explanation:
b × (5 + √7) = 90
⇒ b = 90
----------
5 + √7
Rationalizing the denominator,
b = 90 5 - √7
------------ × ----------
5 + √7 5 - √7
= 90(5 - √7)
----------------
5 - 7
= 450 - 90√7
------------------
-2
- 450 + 90√7
⇒ b = -------------------
2
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