Question

помогите пожалуйста​

Answer 1

2x²+7x-9=0

D=b²-4ac=7²+4*2*9=49+72=121=11²

< var > x_{1,2}= \frac{-b+-\sqrt{D}}{2a} < /var ><var>x

1,2 = 2a −b+− D </var>

x₁=< var > \frac{-7+11}{4} < /var ><var>

4−7+11 </var> =< var > \frac{4}{4} < /var ><var>

4 4</var> =1

x₂=< var > \frac{-7-11}{4}=\frac{-18}{4}=-4,5 < /var ><var> 4−7−11= 4−18=−4,5</var>