Question

In the following equations, take x as the given number and compute y.

i. y = x2+ 3x + 5, x = -4
ii. y = x3+ x2+ x + 1, x = -1

Answer 1

Answer:

i. y is 9

ii. y is -2

Step-by-step explanation:

y = x²+ 3x + 5

Put x = -4

y = (-4)² + 3(-4) + 5

y = 16 - 12 + 5

y = 4 + 5

y = 9

y = x³ + x² + x + 1

Put x = -1

(-1)³ + (-1)² + (-1) + 1

= -1 + 1 - 1 + 1

= -3 + 1

= -2

Answer 2

Answer:

$- 4 \times 2 + 3 \times - 4 + 5 = - 15 \\ -1 \times 3 + - 1 \times 2 + 1 = - 4$