Question

Tolong soal nomer 13,pada gambaR dbawah ini.

Answer 1

P = (x + y)
Q = (y + x)

Maka p² + q²
(x + y)² + (y + x)²
[ (x + y)(x + y) ] + [ (y + x)(y + x)]
[ x(x) + x(y) + y(x) + y(y) ] + [y(y) + y(x) + x(y) + x(x) ]
[ x² + xy + xy + y² ] + [ y² + xy + xy + x²]
[ x² + 2xy + y²] + [y² + 2xy + x²]
x² + 2xy + y² + y² + 2xy + x²
(x² + x²) + (2xy + 2xy) + (y² + y²)
2x² + 4xy + 2y²
--------------------  : 2
  x² + 2xy + y²  =  (x + y)²

Jadi 2(x + y)²

Jawabannya yang C. 2(x + y)²