Question

3x²+5x-30, para:

A) x=4

B) x=1

C) x=-6

D) x=0

Answer 1

3x²+5x-30, para:

A) x=4

= 3x² + 5x - 30

= 3.4² + 5.4 - 30

= 3.16 + 20 - 30

= 48 - 10

= 38

B) x=1

= 3x² + 5x - 30

= 3.1² + 5.1 - 30

= 3 + 5 - 30

= 8 - 30

= - 22

C) x= - 6

= 3x² + 5x - 30

= 3.(-6)² + 5.(-6) - 30

= 3.36 - 30 - 30

= 108 - 60

= 48

D) x=0

= 3x² + 5x - 30

= 3.0² + 5.0 - 30

= 0 + 0 - 30

= - 30