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Write each of the following as a polynomial in descending powers of its variable

1. 7x(x+3)

2. (7x+1)(x+3)

3. (x²+x)²

Sagot :

Panoyin
1. 7x(x + 3)
    7x(x) + 7(3)
    7x² + 21

2. (7x + 1)(x + 3)
    7x² + 21x + x + 3
    7x² + 22x + 3

3. (x² + x)²
    (x² + x)(x² + x)
   x^4 + x³ + x³ + x²
   x^4 + 2x³ + x²
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