This fits the standard identity a square + 2ab + b square. The first term is the square of 7g and the last is the square of h, which yields the grouped factor (7g + h) square.
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This matches the three-term identity where the term containing variable b is negative because both cross-product terms that include b have a minus sign in the expression.
We separate 205 into 200 + 5 and use the addition square identity. Calculating the squares of both numbers and adding their double cross-product gives the final evaluation.
We express the product as (20 – 2) (30 – 1) and expand using the distributive property. Evaluating the separate numerical products step by step gives the clean final total.
We split 135 into 100 + 30 + 5 and expand it using the three-term identity. Summing the separate square values and their paired products provides the final answer.