Using contributive law, find the square of 43
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The square of 43 using the contributive law is as follows
43
= 40 + 3
43² = (40 + 3)²
we use the formula,
(a + b)² = a² + b² + 2ab
(40 + 3)² = 40² + 3² + 2 × 40 × 3
= 1600 + 9 + 240
= 1849
⇒ (40 + 3)² = 1849
∴ 43² = 1849
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Answer:
ok guys
1849 43 square
1600 + 9
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