So before we can solve using the quadratic formula, we have to set the equation to zero. We can do that by adding 2 on both sides of the equation ![-5y^2 + 2y +2 =0](https://tex.z-dn.net/?f=%20-5y%5E2%20%2B%202y%20%2B2%20%3D0%20)
Now we can use the quadratic formula, which is
, with a=x^2 coefficient, b=x coefficient, and c=constant. We can form the equation as such: ![y=\frac{-2+\sqrt{2^2-4*(-5)*2}}{2*(-5)},\frac{-2-\sqrt{2^2-4*(-5)*2}}{2*(-5)}](https://tex.z-dn.net/?f=%20y%3D%5Cfrac%7B-2%2B%5Csqrt%7B2%5E2-4%2A%28-5%29%2A2%7D%7D%7B2%2A%28-5%29%7D%2C%5Cfrac%7B-2-%5Csqrt%7B2%5E2-4%2A%28-5%29%2A2%7D%7D%7B2%2A%28-5%29%7D%20)
Firstly, solve the exponents and the multiplications: ![y=\frac{-2+\sqrt{4+40}}{-10},\frac{-2-\sqrt{4+40}}{-10}](https://tex.z-dn.net/?f=%20y%3D%5Cfrac%7B-2%2B%5Csqrt%7B4%2B40%7D%7D%7B-10%7D%2C%5Cfrac%7B-2-%5Csqrt%7B4%2B40%7D%7D%7B-10%7D%20)
Next, do the addition within the radicals (these will be your exact solutions. but I'll solve for the decimal form as well.): ![y=\frac{-2+\sqrt{44}}{-10},\frac{-2-\sqrt{44}}{-10}](https://tex.z-dn.net/?f=%20y%3D%5Cfrac%7B-2%2B%5Csqrt%7B44%7D%7D%7B-10%7D%2C%5Cfrac%7B-2-%5Csqrt%7B44%7D%7D%7B-10%7D%20)
Next, solve for the rest on your calculator, and your answers will be (rounded to the thousandths) y = -0.463, 0.863
Answer:
28
Step-by-step explanation:
7×4=28 hope this help
Subtract it so that you can get your answer
Answer: A
Step-by-step explanation:
I did this test before : )