book Maths Puzzle Numerical Ability

i need to state the value of the discriminant for the following equation of 2x squared= .7x + .o

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book Other Question

i MADE The mistake when I was solving equations and did this

The equation 2(x-2) = x +3
First step in solving 2x-2=x+3

What error did I make? How could I avoided it? thanks i dont understand algebra i took it this year for freshmen and i dont get it i get some stuff but not alot but im not dumb my teacher just talked to fast..