Answer:
The answer is: 1
Step-by-step explanation: f(1) = -1, so f(-1) must be 1.
x-8°+20°= 90°
=>x+12°=90°
=>x=90°-12°
=>x= 78°
2x^2 + 14x + 12 = 0
x^2 + 7x + 6 = 0
( x + 1 )( x + 6 ) = 0 ==》 x = - 1 Or x = - 6
1: 4
2: 2
3: 8
Step-by-step explanation:
B