Which expression is equivalent to 7x – 6?
2 answers:
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Actually, the answer is not A, if you're saying A is the first choice above. That's incorrect. You will need to use the Geometric mean for right triangles here to figure out what the value of a is. We will use this form: 
. We have a value for YZ of 3; side a is XZ. That means in order to solve this we need WZ, which we can find using pythagorean's theorem. 3^2 + 4^2 = c^2 and 9 + 16 = c^2 and c = 5. Now we fill in accordingly: 
. Cross-multiply to get 3XZ=25 and side XZ is 
. XZ is 25/3 and YZ is 3, so 25/3 - 3 = XY. That means that XY (side a) = 16/3 or 5 1/3, choice B, or the second one down.
Answer:
C.
and
Step-by-step explanation:
You have the quadratic function to find the solutions for this equation we are going to use Bhaskara's Formula.
For the quadratic functions with
the Bhaskara's Formula is:
It usually has two solutions.
Then we have where a=2, b=-1 and c=1. Applying the formula:
Observation:
And,
Then the correct answer is option C.
and