Question

Give exact and approximate solutions to three decimal places. x^2-7x+11=0

Answer 1

You're probably expected to use the quadratic formula for this. I hate the quadratic formula so I'll just tell you how to do it.

Memorize it, then learn how to derive it and you'll never forget it. It's:

x = [ -b +/- sqrt(b² - 4ac) ] / (2a)
The x, a, b, and c come from:

0 = ax² + bx + c

If this looks familiar it's because quadratic equations are always in this form. a, b, and c are constants that change depending on the equation. In this case there seems to be no a, but in reality it's just one.
a = 1
b = -7
c = 11

Plug it in and have fun.

Answer 2

< http://www.mathsisfun.com/quadratic-equation-solver.html > to check your answers.

Answer 3

thanks