F (x) = 2x² - 10x + 13

Find f (-4)

85

Step-by-step explanation:

In this question, you would solve by plugging in -4 to x.

Solve:

f(-4) = 2(-4)² - 10(-4) + 13

= 2(16) + 40 + 13

= 32 + 40 + 13

= 72 + 13

= 85

f(-4) = 85

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb