Question

find the area of a square length of each side is 3 X + 5 metre​

Answer 1

Length of square = 3x+5
Area of square = length×length
= (3x+5) (3x+5)
= 9x^2+15x+15x+25
=9x^2+30x+25

Area of the square = 9x^2+30x+25

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Answer 2

We know that,

area of square = a² {side =a}

(3x+5)² {(a+b)² = a²+b²+2ab}

=3x²+5²+2(3x)(5).

=9x²+25+30x

=9x²+30x+25