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What is the expansion of ( (x+5)^2 )?

Answer and explanation

Correct answer: (x^2+10x+25)

The direct answer is A: \\(x^2+10x+25\\). Use the identity \\(a+b\\)^2=a^2+2ab+b^2\\). Here a=x and b=5. First, \\(a^2=x^2\\). Next, \\(2ab=2\\times x\\times5=10x\\). Finally, \\(b^2=5^2=25\\). Combining the three parts gives \\(x^2+10x+25\\), so A is correct. Option B has 5x instead of 10x because it forgets the factor 2 in the middle term. Option C leaves out the cross term completely; it is not the square of a sum. Option D has a negative middle term, which belongs to \\(x-5\\)^2\\), not \\(x+5\\)^2\\). Direct multiplication also confirms it: \\(x+5\\)(x+5)=x^2+5x+5x+25=x^2+10x+25\\). Memory cue: in a plus square, the middle term is positive twice the product.

Related tags

Algebraic IdentitiesSquare ExpansionBinomial

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