Teresa says that because the diagonals of a parallelogram bisect each other, if one diagonal is 4.2 cm, the other diagonal must
be half that length. Use words and pictures to explain Teresa’s error.
1 answer:
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Answer:
Given,
Now,
Use the algebraic identity ⇻ (a - b)² = a² - 2ab + b²
✐ So, the value of 9x² + 4y² - 1 is <u>24 + 12xy</u>
Now,
xy = - 2
So, 12xy = 12 × - 2 =<u> - 24</u>
•°• 24 + 12xy
= 24 + (-24)
= 24 - 24
= <u>0</u>
<h3>⎆ The value of 9x² + 4y² - 1 is <u>0</u>.</h3>ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
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