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Answer:
[tex]3x { }^{2} + 16x + 21[/tex]
Step-by-step explanation:
[tex]3x \times x = 3x {?}^{2} [/tex]
[tex](3x \times 3 = 9x) + (7 \times x = 7x)[/tex]
[tex]7 \times 3 = 21[/tex]
FOIL method.