If –1 is a root of f(x), which of the following must be true?

2 answers:

7 0

The correct answer is that a factor of f(x) is (x+1)

This is due to the zero product property, which states that if two binomials multiply to 0, then one of its factors must equal 0.

(x+1) must equal 0.
(x+1)=0
x=-1

If (x-1)=0, then x would equal 1 instead of -1 which is what the question is asking for.

dolphi86 [110]3 years ago

3 0

Answer:

The answer is B on edg

Step-by-step explanation:

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Okay this is my last one.. I think dfghmhgfd

Ainat [17]

<h2>○=> <u>Correct option</u> :</h2><h2> $\color{plum}\tt\bold{(B)}$ </h2><h3>○=> <u>Steps to derive correct option</u> :</h3>

We know that :

$\color{hotpink} \tt \: circumference \: of \: a \: circle\color{plum} = 2\pi r$

So, let the diameter of this circle be x.

Which means :

$=\tt2 \times \pi \times r$

$=\tt 2 \times x \times \pi = 12\pi$

$=\tt 2x\pi = 12\pi$

$=\tt x = \frac{12}{2}$

$= \tt \: x = 6 \: m$

Thus, the radius of the circle Robert drew = 6 m

Since the circle in option B has a radius of 6 m, it is the circle Robert drew.

▪︎<em>Therefore, the correct option is (B)</em>

8 0

3 years ago

Find the simultaneous equation x-2y=1,y^2-3xy+8=0

Hitman42 [59]

Answer:

(-2.2, -1.6), (3, 1)

Step-by-step explanation:

You don't have to go far to find the equations. They are right there in your problem statement. Perhaps you want to find the solutions to the equations.

Use the first equation to write an expression for x, then substitute that into the second equation:

x = 2y +1

y^2 -3(2y+1)(y) +8 = 0

-5y^2 -3y +8 = 0

-(5y +8)(y -1) = 0

y = -8/5 or y = 1

The corresponding values of x are ...

x = 2(-8/5)+1 = -11/5

x = 2(1) +1 = 3

The solutions are (x, y) = (-2.2, -1.6) and (3, 1).