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dexar [7]
3 years ago
5

Factor the expression. 21x^2 + 43x + 20

Mathematics
2 answers:
liq [111]3 years ago
6 0
Hello,

21x^2 + 43x + 20\\
=21x^2+28x+15x+20\\
=7x(3x+4)+5(3x+4)\\
=(3x+4)(7x+5)\\

Answer B
krok68 [10]3 years ago
3 0
Each choice has 7x and 3x which multiply to 21x^2.
The original trinomial has positive 20 and positive 43, so all factors of 21 and of 20 must be positive.
Only choice B has all positive terms, so choice B must be the answer.
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