Question

5x^2+7x-66=0

I dont know if I got the right answer, can someone help me?

I got x= (4.4,3)

Answer 1

HINT: Use quadratic formula

Answer 2

Use:
x = \[x = (-b^{2} \pm \sqrt{b^{2}-4ac})/2a\]
Where the eq is \[a x^{2} +bx + c\]

Answer 3

\[5x ^{2}-15x+22x-66=0\]
5x(x-3)+22(x-3)=0
(5x+22)(x-3)=0