5(3-2a)(2a+3)-2(a-5)^2+5

Question

5(3-2a)(2a+3)-2(a-5)^2+5

Answer 1

5(6a+9-4a^2-6a)-2(a^2-10a+25)+5=0
30a+45-20a^2-30a-2a^2+20a-50+5=0
-22a^2+20a=0
-11a^2+10a=0
a(-11a+10)=0
a=0 или a=0,9