Question

What are the approximate solutions of 5x2 − 7x = 1 rounded to the nearest hundredth?

Answer 1

your equation can be rewritten into
\[ \large 5x^2-7x-1=0 \]
use the general formula. do u know it?

Answer 2

well it's x=0.16 or x=1.24

Answer 3

try using the quadratic formula yourself and checking with my answers.

Answer 4

No real solutions

x ≈ −0.65 and x ≈ 7.65

x ≈ −1.53 and x ≈ 0.13

x ≈ −0.13 and x ≈ 1.53

these are the answer choices.

Answer 5

it is the 3rd one

Answer 6

here a good site http://www.math.com/students/calculators/source/quadratic.htm

Answer 7

but do u know how to get this

Answer 8

just plug in

Answer 9

no, could you please explain?

Answer 10

the cuadratic formula gives u
\[ \large x=\frac{7\pm\sqrt{49-4\cdot5\cdot(-1)}}{10}=\frac{7\pm\sqrt{69}}{10} \]

Answer 11

okay thank you

Answer 12

finally
\[ \large \sqrt{69}\approx8.3066 \]