Question

3+2x la 2 -(x-2)la 2=-3x-7

Answer 1

^2 inseamna la puterea a 2
3+2x^2-(x^2-4x+4)=-3x-7
3+2x^2-x^2+4x-4=-3x-7
x^2+4x-1=-3x-7
x^2+4x+3x=-7+1
x^2+7x=-6
x^2+7x+6=0
delta =-b^2-4ac
delta =49-24=25
x1=-7+√25/2=-7+5/2=-2/2=-1
x2=-7-√25=-7-5/2=-12/2=-6
deci x€ {-6,-1}