Jawaban:

1. -7

2. koefisien x² = 3

koefisien x = 14

3. 5 dan 3

4. 9 dan 5

5. f(x) = 3x² - 13x - 10

6. -6/8

7. -36

Penjelasan dengan langkah-langkah:

1. y = 5x² - 2x + 10

a = koefisien x² = 5

b = koefisien x = -2

c = konstanta = 10

a + b - c

= 5 + (-2) - 10

= 3 - 10

= -7

2. y = (3x + 2) (x + 4)

y = 3x² + 12x + 2x + 8

y = 3x² + 14x + 8

koefisien x² = 3

koefisien x = 14

3. x² - 8x + 15 = 0

(x - 5) (x - 3) = 0

x = 5

x = 3

4. x² - 14x + 45 = 0

(x - 9) (x - 5) = 0

x = 9

x = 5

5. (3x + 2) (x - 5)

= 3x² - 15x + 2x - 10

= 3x² - 13x - 10

6. -b/2a = ¾

-m/2(1) = ¾

-m = 6/8

m = -6/8

7. d = b² -4ac

d = (-2)² -4(2)(5)

d = 4 - 40

d = -36