Question

Помогите срочно очень!
Упростите:
1)(3x-5)(2x+9)
2)(t-3)^2
3)(7c+3)(7c-3)

Answer 1

1)=6x^2+27x-10x-45=6x^2+17x-45
2)=t^2-6t+9
3)=49c^2-21c+21c-9=49c^2-9