Question

Jika 25x²-(x+1)²=(ax+b)(cx+d) maka a+b+c+d adalah
a. 7
b. 8
c. 9
d. 10
e. 13

Answer 1

Jawab:

Penjelasan dengan langkah-langkah:

A²- B²= (A - B) (A + B)

25x²-(x+1)²= 5²x²-(x+1)²

=(5x)² - (x+1)²

= (5x - (x+1)) (5x + (x+1))

= (5x - x - 1) (5x + x + 1)

= (4x - 1) (6x + 1)

=(ax+b)(cx+d)

a = 4

b = -1

c = 6

d = 1

a + b + c + d = 4 - 1 + 6 + 1 = 10

Answer 2

Jawab: d

Penjelasan dengan langkah-langkah:

= 25x2 - x2 - 2x - 1

= 24x2 - 2x - 1

= (6x + 1)(4x + (-1))

Jadi a + b + c + d = 6 + 1 + 4 - 1

= 10