1) a^2+14a+49
2)9x^2-24xy+16y^2
3)m^2-36
4)64b^2-25a^2
1) (a-3)(a+3)
2) (b+5)^2
3) (5x-4)(5x+4)
4) (3x-2y)^2
6y^2+2y-9y-3+2y^2-50=2-8y+8y^2+6y
7y-2y+2+53=0
5y=-55
x=-11
((6a-7)+(4a-3))((6a-7)-(4a-3))= (6a+4a-7-3)(6a-4a-7+3)= (10a-10)(2a-4)= 10(a-1)*2(a-2)= 20(a-1)(a-2)