(49x²+21x-21x-9)
Answer: 49x²-9
hope this helps
Answer:
6
Step-by-step explanation:
1.8 divided by 0.3 = 6
6 x 0.3 = 1.8
Step-by-step explanation:
x= 180-109 = 71°
y= 360-81-71-100= 108
Answer:
no
Step-by-step explanation:
Just plug it in
-4(4) + 3(1) = 2
-16 + 3 = 2
-13 = 2
Without even solving the second equation, the answer is no because -13 does not equal 2
Answer:
cos (a+b)= cos a cos b - sin a sin b
Step-by-step explanation:
I had to answer this question too, but I don't know the explanation. I just saw it in this Khan Academy video. https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:trig/x9e81a4f98389efdf:angle-addition/v/cosine-addition-identity-example