Calculate the value of 58 square using the formula for (a - b) square
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58
= (60-2) square
= 60sq + 2× 60 × 2 - 2 sq
= 3600 + 240 - 4
= 3840- 4
= 3836
formula = (a-b) sq
= a sq + 2×a ×b - bsq
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