I need help solving these problems

y=-0.4x^2+8.3x+4.3 I got 0.52

h=-16t^2+149t+30 I got 640.5 feet after 4.63 seconds

0=x^2+3x-10 I got x=5, -2

(2x-4)(2x-1)=0 I got -2, 1/2

x^2+8x=10 I got -1.1, 9.1

HELP PLEASE

1 answer

Type in your function here, and it will give you the roots and other info.

http://www.wolframalpha.com/input/?i=-0.4x%5E2%2B8.3x%2B4.3

On this one,
x^2+3x-10 = 0
you should have factored it:
(x+5)(x-2) = 0
Then you would have seen that the roots are -5 and 2, rather than what you wrote.
Similar Questions
  1. i need help in solving these 2 problems...please help..thank you...Your home is built on a square lot. To add more space to your
    1. answers icon 2 answers
  2. So I've been having trouble solving some problems.Mainly problems that look like this 5-(t+3)=-1+2(t-3) what causes problems is
    1. answers icon 0 answers
    1. answers icon 3 answers
  3. Fill in the blanksSolving Fraction Word Problems Kevin is working with a group of community volunteers to replace rotting boards
    1. answers icon 1 answer
more similar questions