1.
a)3(-2)+a=2(-2)-12
-6+a=-14
a=-8
b)5(-2)+a=3(-2)+2
-10+a=-6+2
a=10-4
a=6
2.
a)3x²-√2x-6x+2√2=0
3x²-x(√2+6)+2√2=0
Δ=(√2+6)²-4·3·2√2
Δ=2+12√2+36-24√2
Δ=38-12√2
b)x-2=4 =>x=6
-x+2=4 =>x=-2
c)2x=2√2+√2
2x=3√2 =>x=3√2/2
d)√2x-2x=4-2√2
x(√2-2)=2(2-√2) =>x=2(2-√2)/(√2-2)=-2(√2-2)/(√2-2) =>x=-2