Simplify 16+25+5(7+45).
Explanation:
Let x = 16+25+5(7+45)
Let us first calculate 6+25 = 5+1
Now, x = 1(5+1)+5(7+45)
⇒ x = 1(5+1)+75+20
⇒ x = 121+85
Now, 21+85 = 4+5
⇒ x = 14+5
On rationalising with 4 - √5, we get
⇒ x = 4-511
Hence, option (c).
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