➡️ (n+7)²
➡️ n²+2×7×n+7²
➡️ n²+14n+49
➡️ Rewrite 49as 7²
➡️n²+14n+7²n²+14n+72
➡️ Check the middle term by multiplying 2ab2ab and compare this result with the middle term in the original expression.
➡️ 2ab=2⋅×n⋅×7
➡️ Simplify.
➡️
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Answers & Comments
n²+2×7×n+7²
n²+14n+49
therefore, ___=14n
➡️ (n+7)²
➡️ n²+2×7×n+7²
➡️ n²+14n+49
➡️ Rewrite 49as 7²
➡️n²+14n+7²n²+14n+72
➡️ Check the middle term by multiplying 2ab2ab and compare this result with the middle term in the original expression.
➡️ 2ab=2⋅×n⋅×7
➡️ Simplify.
➡️
➡️
➡️
➡️
➡️