text: ## Precalculus: Mathematics for Calculus, 7th Edition
  
  $25x^2+10x+1$
  $Multiply$ $the$ $algebraic$ $expressions$ $using$ $a$ $Special$ $Product$ $Formula$ $and$ $simplify:$ $(5x+1)^2$ Use the Square of a Sum Product Formula: $(A+B)^2 = A^2+2AB+B^2$ $(5x+1)^2 = (5x)^2+(2\times5x\times1)+(1)^2$ $(5x\times5x) + 10x + 1$ $=25x^2+10x+1$