Hi:) anyone able to explain how to find the value of a? Thank you:)
2 answers:
Answer:
a=2
Step-by-step explanation:
Please see attached picture for full solution.
Method 1: Substitute x with another number, other than the numbers that you have already tried. Zero is a good number to work with :)
Then, subst. the values of b and c which you have already found into the equation. Then simplify to arrive at your answer.
Method 2: Notice that when you expand the right hand side, only a(x)() can give you a
term. Hence, compare the coefficients of
on both sides. This method is quite safe since the value of a won't be affected in case the value of b and c is wrong.
You might be interested in
The quadratic formula is:
and
In this case, a = 2, b = -3, and c = -7
So, we can plug in the numbers to get:
and
Simplifying, we get:
and
You need to use a calculator to find what these would be in decimal form. The answer, rounded to the nearest tenth, is: x = 2.8, x = -1.3