Question

multiply the following using appropriate identities ?? please give me answers...plz​

Answer 1

Answer:

Step-by-step explanation:

$(x+7)(x+7) = (x+7)^{2} = x^{2}+2(7)(x)+ 7^{2} = x^{2}+14x+49\\\\(3x+1)(3x-8)= (3x)^{2} + (1-(8))3x + (-8)(1) = 9x^{2} + 21x -8$