Question

ahhhhh fast my exam time is going to end​

Answer 1

Answer:

343a^3

Step-by-step explanation:

7(49^2 +35ab+25b^2)

=343a^3 +245a^2b+175ab^2

5b(49a^2 +35ab+25b^2)

=245a^2 +175ab^2 +125b^3

=343+245a^2 b+175ab^2-245a^2 b-175ab^2 - 125b^3

Final ans..

=343a^3-125b^3

Answer 2

Step-by-step explanation:

4.

(i)

[(23+4)^2/3 +(121)^1/2]²

= [(27)^2/3+(11^2)^1/2]²

= [(3^3)^2/3+11]²

= (3^2+11)²

= (9+11)²

= 20²

= 400

(ii)

(7a – 5b)(49a² + 35a + 25b²)

⇒ 7a(49a² + 35ab + 25b​​²) - 5b(49a² + 35ab + 25b²)

⇒ 343a³ + 245a²b + 175ab² - 245a²b - 175ab² + 125b³

⇒ 343a³ + 245a²b - 245a²b + 175ab² - 175ab² + 125b³

⇒ 343a³ + 125b³

Hope it helps!