Question

Solutia ecuatiei (3x-5)(3x+5)=9(x²+x+2) este
a)-43/9
b)7/9
c)2/9
d)43/9

Answer 1

$\displaystyle (3x-5)(3x+5)=9(x^2+x+2) \\ 9x^2-25=9x^2+9x+18 \\ 9x^2-9x^2-9x=18+25 \\ -9x=43 \\ x=- \frac{43}{9}$