Question

plz someone do these two sum for me step by step
if don't know plz stay away
best anwer will be mark as brainlist .....
these are very important questions​

Answer 1

Step-by-step explanation:

11.

Given Equation is a - b = 3 and ab = 4

a³ - b³ = (a - b)³ + 3ab(a - b)

          = 3³ + 3(4)(3)

          = 27 + 36

        = 63

(12)

Given: 2a - 3b = 3

On cubing both sides, we get

⇒ (2a - 3b)³ = 3³

⇒ 8a³ - 27b³ - 3(2a)(3b)(2a - 3b) = 27

⇒ 8a³ - 27b³ - 18(ab)(2a - 3b) = 27

⇒ 8a³ - 27b³ - 108 = 27

⇒ 8a³ - 27b³ = 135

Hope it helps!

Answer 2

HEY MATE HERE IS YOUR ANSWER--

EQUATION GIVEN :-

A-B=3

AB =4

(A-B)³➾(a-b)³+3ab(a-b)

➾ (3)³+3×4(3)

➾ 27+36

➾ 63

GIVEN 2A-2B =3

on cubing both side :-

➾ (2a-3b)³= 3³

➾ 8a³-27b³- 3(2a)(3b)(2a-3b)=27

➾ 8a³-27b³-18 (ab)(2a-3b)=27

➾ 8a³-27b³-108=27

➾ 8a³-27b³=135