Question

please answer if u know


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Answer 1

5. Expand ( 7x - 2y )²

==> (7x - 2y)²

==> (7x)² + (2y)² - 2 • 7x • 2y

(a - b)² = a² + b² - 2ab

==> 49x² + 4y² - 28xy

6. Evaluate using suitable identity: (103)²

==> (103)³

==> (100 + 3)³

==> (100)³ + (3)³ + 3•3•100 ( 100 + 3 )

(a + b)³ = a³ + b³ + 3ab( a + b )

==> 1000000 + 27 + 900( 103 )

==> 1000027 + 92700

==> 1092727

Answer 2

5.(7x-2y)²

(7x)²-2×7x×2y+(2y)²

49x²-28xy+4y²

6.(103)³

(100+3)³

(100)³+(3)³+3×100×3(100+3)

10000+27+900(100+3)

1000000+27+90000+2700

1092727