Question

what is (3x+5)^2

Answer 1

\[\huge\color{red}{ (a+b)^2=a^2+2ab+b^2 } \]

Answer 2

(3x + 5) ^2
(3x + 5)(3x + 5)
use FOIL method (First,Outside,Inside,Last
multiply first terms in each set ....3x * 3x = 9x^2
multiply outside terms in each set...3x * 5 = 15x
multiply inside terms in each set...5 * 3x = 15x
multiply last terms in each set ... 5 * 5 = 25
now we have :
9x^2 + 15x + 15x + 25 -- combine like terms
9x^2 + 30x + 25 <== your answer

any questions ?