Answer:
k=-1/5
Step-by-step explanation:
Factor and set each factor equal to zero.
Add 3 to both sides of the equation.
75k^2+30k+3=0
Factor 3 out of 75k^2+30k+3.
Factor using the perfect square rule.
Divide each term by 3 and simplify.
Set the 5k+1 equal to 0.
Solve for k.
Answer:
exact form: -28/8
decimal form: -3.625
mixed number form: -3 5/8
Answer:
x=-5+3√2 or x=-5-3√2
Step-by-step explanation:
use the quadratic formula
where as a=1 b=10 c=7
and solve it
Answer:
(√6 - √2)/4
Step-by-step explanation:
cos30°cos45° - sin30°sin45°
= cos (30 + 45)°
= cos 75°
= (√6 - √2)/4