Can someone help me understand how to solve this problem?
1 answer:
Answer:
Step-by-step explanation:
Multiply both sides of the equation by 10:
9x²+7x-2=0
Write 7x as a difference:
9x²+ 9x-2x -2 =0
Factor the expression:
9x x (x+1)-2x-2 = 0
9x x (x+1) - 2 (x+1) =0
Then seperate them into possible cases:
(x+1) x (9x-2) = 0
x+1 = 0
9x - 2= 0
The equation has 2 solutions:
x1 = -1
x2 =
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Answer:
cos P = 53 degrees
cos Q = 37 degrees
Step-by-step explanation:
cos P =
cos P =
cos P = 0.60
Cos-1 of 0.60 is 53.13 (round to the nearest whole number)
cos P = 53 degrees
cos Q =
cos Q =
cos Q = 0.80
Cos of 0.80 is 36.86 (round to the nearest whole number)
cos Q = 37 degrees
To check anser:
90 + 53 + 37 = 180
180 = 180