Bantuuuuuuuuu PAKAI JALANNNNNJANGAN NGASALLLLLLL

Bantuuuuuuuuu PAKAI JALANNNNNJANGAN NGASALLLLLLL

Jawaban:

$1.) sqrt{98} - sqrt{72} = \ = 7 sqrt{2} - 6 sqrt{2} \ = (7 - 6) sqrt{2} \ = 1 sqrt{2} \ = sqrt{2} \ \ 2.) : {2x}^{2} - 3x - 5 = 0 \ {2x}^{2} + 2x - 5x - 5 = 0 \ 2x times (x + 1) - 5x - 5 = 0 \ 2x times ( x + 1) - 5(x + 1) = 0 \ (x + 1) times (2x - 5) = 0 \ x + 1 = 0 \ 2x - 5 = 0 \ x1 = - 1 \ x2 = frac{5}{2}$