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A binomial squared (sum) is equal to the square of the first term, plus the double product of the first by the second, plus the square of the second term. In other words: $(a+b)^2=a^2+2ab+b^2$
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$d=x^2+6x+9-x^2$
Learn how to solve equations problems step by step online. Find the roots of d=(x+3)^2-x^2. A binomial squared (sum) is equal to the square of the first term, plus the double product of the first by the second, plus the square of the second term. In other words: (a+b)^2=a^2+2ab+b^2. Cancel like terms x^2 and -x^2. Rearrange the equation. Factor the polynomial 6x+9 by it's greatest common factor (GCF): 3.