Luna6012 Luna6012

21-04-2021
Mathematics

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What is the value of c^2-d^2 if c+d=7 and c-d=-2?

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jimrgrant1 jimrgrant1

21-04-2021

Answer:

- 14

Step-by-step explanation:

c² - d² ← is a difference of squares and factors as

= (c + d)(c - d) ← substitute values for factors

= 7 × - 2

= - 14

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