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a^2/4-ab+b^2
a^2-4ab+4b=0
(a-2b)(a-2b)=0
(a-2b)^2=0
a-2b=0
a=2b
16)
15m^2+m-6=0
(15m)^2+(15m)-90=0
(15m+10)(15m-9)=0
15
(3m+2)(5m-3)=0
3m+2=0 5m-3=0
3m=-2 5m=3
m=-2/3 m=3/5
17)
x^2-17x-60=0
(x-20)(x+3)=0
x-20=0 x+3=0
x=20 x=-3
18)
2a^2+5a+2=0
(2a)^2+5(2a)+4=0
(2a+4)(2a+1)=0
2
(a+2)(2a+1)=0
a+2=0 2a+1=0
a=-2 a=-1/2
19)
x^2-7x-30
(x-10)(x+3)=0
x-10=0 x+3=0
x=10 x=-3
20)
2x^2+3x-2=0
(2x)^2+3(2x)-4=0
(2x+4)(2x-1)=0
2
(x+2)(2x-1)=0
x+2=0 2x-1=0
x=-2 x=1/2
Espero haberte ayudado