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What is the general expansion of ( (x+a)(x+b) )?

Answer and explanation

Correct answer: (x^2+(a+b)x+ab)

To expand \((x+a)(x+b)\), multiply each term in the first bracket by each term in the second bracket. This gives \(x\times x+x\times b+a imes x+a imes b\), or \(x^2+bx+ax+ab\). The middle terms have the common factor \(x\), so \(bx+ax=(a+b)x\). Therefore the general expansion is \(x^2+(a+b)x+ab\), which is option D.

The expression contains a square term from multiplying x by x, a linear term from the two cross-products, and a constant term from multiplying a by b. Option B has \(a-b\), although the cross-products are added, not subtracted. Option C omits the linear term, and option A has an incorrect product and constant arrangement. Hence option D follows directly from distribution.

Related tags

General IdentityX Plus AX Plus B

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