Tolong jawab nomor 1-4 ,butuh bangetttt plissss

Tolong jawab nomor 1-4 ,butuh bangetttt plissss

Jawaban:

$1. : : : : {x1}^{2} + {x2}^{2} \ = {(x1 + x2)}^{2} - 2(x1 times x2) \ = {( frac{ - b}{a} )}^{2} - 2( frac{c}{a} ) \ = {( frac{8}{2}) }^{2} - 2( frac{3}{2} ) \ : : : = 16 - 3 \ = 13$

$2. : : : x1 = 3 : : : : x2 = 4 \ (x - x1)(x - x2) = 0 \ (x - 3)(x - 4) = 0 \ {x}^{2} - 4x - 3x + 12 = 0 \ {x}^{2} - 7x + 12 = 0$

$3. : : : x1 = - 2 : : : : x2 = 5 \ (x - x1)(x - x2) = 0 \ ( x + 2)(x - 5) = 0 \ {x}^{2} - 5x + 2x - 10 = 0 \ {x}^{2} - 3x - 10 = 0$

$4. : : :a + b = 30 \ a times b = 200 \ a = 30 - b \ (30 - b) times b = 200 \ 30b - {b}^{2} = 200 \ { - b}^{2} + 30b - 200 = 0 \ {b}^{2} - 30b + 200 = 0 \ (b - 20)(b - 10) = 0 \ b = 20 : : : : b = 10 \ a = 30 - b = 30 - 20 = 10 \$

JADI KEDUA BILANGAN ITU ADALAH 10 DAN 20

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