Answer:
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Step-by-step explanation:
Solving:

Delete the first parentheses by the distributive property, with the distributive property, we multiply the '3' first, then resolve it and the second parentheses eliminate by changing the sign:

<span>Now, put the numbers with letter (incognito) to the right and numbers without letter to the left, changing the signal when changing sides.
</span>



Answer:
A² + 2ab + b² = (a+b)²<span>
</span><span>
So we get
</span><span>16j</span>² + 24j + 9 = (4j+3)²
Like of segment being r, calculated in the picture is the length
Answer: the area for the square is 126.56cm²: