Question

1)x2-8, якщо х=3,9,21. 2) 5у3+1, якщо у=7,10,12

Answer 1

1) 3*2-8, 9*2-8, 21*2-8

2) 5*7(3+1),  5*10(3+1),  5*12(3+1)

Answer 2

To evaluate the given expressions for different values of x and y, simply substitute the given values into the expressions and perform the calculations. Let's evaluate each expression step by step:

1. For the expression x^2 - 8 when x = 3, 9, 21:

a) x = 3: 3^2 - 8 = 9 - 8 = 1

b) x = 9: 9^2 - 8 = 81 - 8 = 73

c) x = 21: 21^2 - 8 = 441 - 8 = 433

So, the values of the expression x^2 - 8 for x = 3, 9, and 21 are 1, 73, and 433, respectively.

2. For the expression 5y^3 + 1 when y = 7, 10, 12:

a) y = 7: 5 * 7^3 + 1 = 5 * 343 + 1 = 1715 + 1 = 1716

b) y = 10: 5 * 10^3 + 1 = 5 * 1000 + 1 = 5000 + 1 = 5001

c) y = 12: 5 * 12^3 + 1 = 5 * 1728 + 1 = 8640 + 1 = 8641

So, the values of the expression 5y^3 + 1 for y = 7, 10, and 12 are 1716, 5001, and 8641, respectively.