volume_mute

(a+4)(a+9)

publish date: 2020/12/29 00:45:00 GMT+11

volume_mute
a^2+12a+36
a+12+36a
a^2+12a+36
a^2-13a-36

Correct Answer

a^2+13a+36

Explanation

Apply FOIL method= (a+b)(c+d)= ac+ad+bc+bd

a= a, b=4, c=a, d=9

=aa+ax9+4a+4x9= a^2+13a+36

Reference

Mathematics for college students

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