Use the quadratic formula to find the zeros of the function. Round to tenths if necessary. y = 17x2 - 21
A. {-1.1, 1.1}
B. {1.1}
C. {-4.1, 4.6}
D. no real solution

Question

Use the quadratic formula to find the zeros of the function. Round to tenths if necessary. y = 17x2 - 21
	A.	{-1.1, 1.1}
	B.	{1.1}
	C.	{-4.1, 4.6}
	D.	no real solution

hoblos · Answer

A

anonymous · Answer

explain pls :)

anonymous · Answer

first equate the equation to 0

anonymous · Answer

substitute the values in the quadratic formula

hoblos · Answer

same formula given before with b=0

anonymous · Answer

$$\Large \frac{{ - b \pm \sqrt {{b^2} - 4ac} }}{{2a}}$$
Knock yourselves out ;)

anonymous · Answer

that

anonymous · Answer

Remember a quadratic is a second-degree polynomial to the form ax^2 + bx + c = 0. Plug the appropriate values in the quadratic formula, presto!

anonymous · Answer

I always feel that formula is very lengthy to remember and use.

hoblos · Answer

you must get to it because you will always need it ;)

anonymous · Answer

I don't specifically remember when I first started memorising the quadratic formula, but what I can remember is the uncountable number of times it's been a useful addition to the memory bank. Like anything, use it a few dozen or so times and it's stuck there for life ;)

anonymous · Answer

(x+1.11) and (x-1.11)
so let x+1.11=0        and           x-1.11=0
then get x=-1.11                        x=1.11

anonymous · Answer

Unfortunately, you guys are right, that formula's very tough but equally useful......