Question

I need to know the answer of both of these​

Answer 1

Answer:

this is the answer.

the camera is not working.

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Answer 2

b) Given :-

30³ + 20³ - 50³

Using identity :- a³ + b³ + c³ = 3ac

Here, a = 30, b = 20 and c = -50

Therefore 30³ + 20³ - 50³ :-

= 3(30 × 20 × -50)

= 3(-30000)

= -90000

c) (i) (x - 1, -3) = (4, x + y)

Equating 4 by x - 1 and x + y by -3

» x - 1 = 4

➡ x = 5 -------(i)

» x + y = -3

➡ 5 + y = -3 [from equation (i)]

➡ y = -3 - 5

➡ y = -8

Hence, x = 4 and y = -8

(ii) (5x - 3y, y - 3) = (4, -4)

Equating 5x - 3y by 4 and y - 3 by -4

➡ 5x - 3y = 4 -------(i)

» y - 3 = -4

➡ y = -4 + 3

➡ y = -1

Putting value of y = -1 in equation (i)

➡ 5x - 3(-1) = 4

➡ 5x + 3 = 4

➡ 5x = 4 - 3 = 1

➡ x = 1/5

Hence, x = 1/5 and y = -1