ACT Math 1.3 Intermediate Algebra
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ACT Math Intermediate Algebra Drill 1, Problem 3. Can you find the value of a in this expression?
|ACT Math||Intermediate Algebra|
|ACT Mathematics||Intermediate Algebra|
Solve equations and inequalities in one variable
Understand the relationship between zeros and factors of polynomials
|Foreign Language||Arabic Subtitled|
|Intermediate Algebra||Quadratic equations (Quadratic Formula)|
|Product Type||ACT Math|
The quadratic equation looks like this:
We are drawing from a line of the equation "ax squared plus bx plus c."
...and we have to figure out what a, b and c are so we can plug them into the right places.
In this case, the 2 comes from here; it's A.
B is here, and it's 4.
And C is here, and it's negative 1.
Now we just plug in the numbers and this is what we get.
Now we just have to simplify. We get negative 4 plus or minus 4 squared which is 16....
...minus 4 times 2, then times negative 1...
... so it's plus 8... and we get negative 4 plus or minus 16 plus 8, or 24, here under
the square root symbol...
...all over 2 times 2, or 4.
Simplify one more time and we have...
Both A -- here... and B -- here.