Question

Упростить выражение1)(a-5)^2+9(a-2) 2)2(b-3)^2+12b3)(a+6)^2+(3a-1)(3a+1)4)(b+4)^2+(2b-5)(2b+5)

Answer 1

1)$a^{2} - 10a+25+9a-18=a^{2}-a+7$
2)$2b^{2}-12b+18+12b=2b^{2} +18$ 
3)$a^{2}+36+12a+9a^{2}-1=10a^{2}+12a+35$ 
4)$b^{2}+8b+16+4b^{2}-25=5b^{2}+8b-9$