Answer:
-16
Step-by-step explanation:
You don't know the number that 12 is multiplied by, so substitute x for it in the equation. then you get 12x = -192 (it has a product of -192, so you can set up an equation). Then solve for x. Divide both sides by 12, and you get x = -16, thus giving the answer to your question.
No, not at all.
The general quadratic equation is
Ax² + Bx + C = 0 .
The roots are real only if (B² - 4AC) is not negative.
That means if you graph it, it touches or crosses the x-axis.
If the graph is up in the air and never touches the x-axis,
then it has no real roots.
Pythagoras; a^2 + b^2 = c^2 So, (6.7)^2 + (5.5)^2 = 75.14 then square root to get, 8.668 (to 3 d.p) hope this helps!!