Question

Tolong bantu
soal matematika ya agak susah​

Answer 1

2. PGSD = √(MN²-(RM+RN)²)

              = √(15²-(8+4)²)

              = √(15²-12²)

PGSD     = √81 = 9 cm

3.x²+y²+6x-4y+4=0 <= masukkan x = -1, y = 6

  (-1)²+6²+6(-1)-4.6+4 = K

K = 1 +6²-6-4.6+4

  = 1+6²-5.6+4

 = 1+6+4

K = 11

4.x²+y² = 25 <= masukkan x = k, y = 4

  k²+4² = 25

  k² = 25 - 16

 k² = 9

  k = ±3