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Answer:
5.
seven x whole square plus two y whole square minus 14xy
49x'2+2y'2-14xy
6.
100+3 whole cube
=1000000+729
1000729
plz follow these are your answers.
plz mark as the brainliest.✌✌✌
Verified answer
5) (7x - 2y)²
= (7x)² - (2y)² +2 x 7x x 2y
= 49x² - 4y² + 28xy
6) (103)³
= ( 100 + 3 )³
= (100)³ - 3ab ( a-b) - b
= 1000000 - 3 x 100 x 3 ( 100 - 3) - (3)³
= 1000000 - 300 x 3 ( 97 ) - 9
= 1000000 -900 ( 97 ) -9
= 1000000 - 87300 -9
= 1000000 - 87309
= 912619