Question

(a)
(17)
(b) (247)2 – (246)2
Q-14 Evaluate (23)2 by using (a + b)2 = a² + b2 + 2ab.
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Answer 1

Answer:

529

Step-by-step explanation:

(23)²

(20+3)²

(20)²+(3)²+2×20×3 [(a+b)²=a²+b²+2ab]

400+9+120

529