Question

Jika (2x+6y).(ax+by)=cx²+8xy-30y³ maka nilai c adalah






tolong dijawab yaa sama caranya

Answer 1

(2x + 6y) (ax + by) = cx² + 8xy - 30y²
2ax² + 2bxy + 6axy + 6by² = cx² + 8xy - 30y²
2ax² + (2b + 6a) xy + 6by² = cx² + 8xy - 30y²

6by² = -30y²
6b = -30
b = -5

(2b + 6a) xy = 8xy
2b + 6a = 8
2(-5) + 6a = 8
-10 + 6a = 8
6a = 18
a = 3

2ax² = cx²
2a = c
2(3) = c
c = 6