Evaluate using the suitable indentity (93)2 – (15)
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a). 93² - 15²
➡ ( a+b ) ( a-b )
➡ ( 93+15 ) ( 93-15 )
➡ ( 108 ) ( 78 )
➡ 8424.
b).58 × 62
➡ ( a+b ) ( a-b ) = a² - b²
➡ ( 60 -2 ) ( 60 + 2 )
➡ 60² - 2²
➡ 3600 - 4
➡ 3596.
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