Expand $(2x+5{)}^2$, using suitable identity.

Expand $(b-7{)}^2$, using a suitable identity.

Expand $(mn+3p{)}^2$, using a suitable identity.

Expand $(xyz-1{)}^2$, using a suitable identity.

Using the identity $(a+b)(a-b)=a^2-b^2,$ find the product $(p+2)(p-2)$.

Using the identity $(a+b)(a-b)=a^2-b^2$, find the product $(1+3b)(3b-1)$.

Using the identity $(a+b)(a-b)=a^2-b^2$, find the product $(4-mn)(mn+4)$.

Using the identity $(a+b)(a-b)=a^2-b^2$, find the following product $(6x+7y)(6x-7y)$.

Evaluate ${51}^2$, using suitable identity.