Answer:
-15
Step-by-step explanation:
5x5 = 15
5-15+5= -15
For this case we have the following quadratic equation:
![-2x ^ 2 = -8x + 8](https://tex.z-dn.net/?f=-2x%20%5E%202%20%3D%20-8x%20%2B%208)
This is equivalent to:
![2x ^ 2-8x + 8 = 0](https://tex.z-dn.net/?f=2x%20%5E%202-8x%20%2B%208%20%3D%200)
Where:
![a = 2\\b = -8\\c = 8](https://tex.z-dn.net/?f=a%20%3D%202%5C%5Cb%20%3D%20-8%5C%5Cc%20%3D%208)
The discriminant is given by:
![d = b ^ 2-4 (a) (c)](https://tex.z-dn.net/?f=d%20%3D%20b%20%5E%202-4%20%28a%29%20%28c%29)
Substituting the values we have:
![d = (- 8) ^ 2-4 (2) (8)\\d = 64-64\\d = 0](https://tex.z-dn.net/?f=d%20%3D%20%28-%208%29%20%5E%202-4%20%282%29%20%288%29%5C%5Cd%20%3D%2064-64%5C%5Cd%20%3D%200)
The discriminant is zero, so the equation has two equal real roots.
Answer:
The equation has two equal real roots.
Answer:
it is linear and proportional
Step-by-step explanation:
Well for 3. you use the Pythagorean theorem to say that 28^2 - 18^2= x^2 so 21.4 and for 4. the Pythagorean theorem says a^2 + b^2 = c^2 with c being the hypotenuse of any right triangle so the sums of the two smaller squares make the sum of the larger square making the answer b
15(x + 1) + 10(x) = 30(4) - 6( 2x - 1) <em>multiplied by 30 to clear the denominator</em>
15x + 15 + 10x = 120 -12x + 6 <em>distributed</em>
25x + 15 = 126 - 12x <em>added like terms</em>
37x + 15 = 126 <em>added 12x to both sides</em>
37x = 111 <em>subtracted 15 from both sides</em>
x = 3 <em>divided both sides by 37</em>