(7x+11y)(7x-11y=?.????????????
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4
Answer :
Now,
(7x + 11y) (7x - 11y)
= (7x)² - (11y)²,
using the identity a² - b² = (a + b) (a - b)
= 49x² - 121y², since 7² = 49 & 11² = 121
Alternative method.
Now, (7x + 11y) (7x - 11y)
= (7x × 7x) - (7x × 11y) + (11y × 7x) - (11y × 11y)
= 49x² - 77xy + 77xy - 121y²
= 49x² - 121y²
#MarkAsBrainliest
Now,
(7x + 11y) (7x - 11y)
= (7x)² - (11y)²,
using the identity a² - b² = (a + b) (a - b)
= 49x² - 121y², since 7² = 49 & 11² = 121
Alternative method.
Now, (7x + 11y) (7x - 11y)
= (7x × 7x) - (7x × 11y) + (11y × 7x) - (11y × 11y)
= 49x² - 77xy + 77xy - 121y²
= 49x² - 121y²
#MarkAsBrainliest
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