Express (x²+ 8x + 15) (x²- 8x + 15) as a difference of two squares.
Ans. - (x²+15)² - (8x)²
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2
Answer:
(x
2
+8x−15)(x
2
−8x−15)
=(x
2
−15+8x)(x
2
−15−8x)
=(x
2
−15)
2
−(8x)
2
....[Using a
2
2
=(a+b)(a−b)]
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