[tex](a+b)^2=a^2+2ab+b^2\\(a-b)^2=a^2-2ab+b^2\\\\(x+7)^2=x^2+2\cdot x\cdot 7+7^2=x^2+14x+49\\(k-9)^2=k^2-2\cdot k\cdot 9+9^2=k^2-18k+81\\(5x+3y)^2=(5x)^2+2\cdot5x\cdot 3y+(3y)^2=25x^2+30xy+9y^2\\(6p-10q)^2=(6p)^2-2\cdot6p\cdot 10q+(10q)^2=36p^2-120pq+100q^2[/tex]
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[tex](a+b)^2=a^2+2ab+b^2\\(a-b)^2=a^2-2ab+b^2\\\\(x+7)^2=x^2+2\cdot x\cdot 7+7^2=x^2+14x+49\\(k-9)^2=k^2-2\cdot k\cdot 9+9^2=k^2-18k+81\\(5x+3y)^2=(5x)^2+2\cdot5x\cdot 3y+(3y)^2=25x^2+30xy+9y^2\\(6p-10q)^2=(6p)^2-2\cdot6p\cdot 10q+(10q)^2=36p^2-120pq+100q^2[/tex]