4(10x−17)2−6(10x−17)+2=0

Question

4(10x−17)2−6(10x−17)+2=0

Answer 1

10x-17=a
4a²-6a+2=0
D=36-32=4
a1=(6-2)/8=1/2⇒10x-17=0,5⇒10x=17,5⇒x=1,75
a2=(6+2)/8=1⇒10x-17=1⇒10x=18⇒x=1,8