Question

Compute y = x² + 9x – 5, for take x as the given number,

i. x = 5 

ii. x = -2 

iii. x = 0 

iv. x = -3

Answer 1

i. x = 5

y = x² + 9x – 5

= 5² + 9 × 5 – 5 = 25 + 45 – 5

= 20 + 45 = 65

ii. x = -2

y = x² + 9x – 5

= (2)² + 9 × (-2) -5

= 4 – 18 – 5 = 4 – 23 = – 19

iii. x = 0

y = x² + 9x – 5

= 0 + 9 × 0 – 5 = -5

iv. x = -3

y = x² + 9x – 5

= (-3)² + 9 × (-3) – 5

= 9 – 27 – 5 = 9 – 32 = -23