1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
SIZIF [17.4K]
2 years ago
7

Which expression is equivalent to x² - 4x - 45?

Mathematics
2 answers:
dolphi86 [110]2 years ago
7 0

Answer:

D

(x - 9)(x+5)

Step-by-step explanation:

x² + 5x - 9x - 45

x · (x + 5) - 9 (x + 5)

(x - 9) (x + 5)

lisabon 2012 [21]2 years ago
6 0

Answer:

D. (x - 9)(x+5)

Step-by-step explanation:

x^{2} - 4x - 45 is your expression, so you have to factor it out. Since from the options available it's clear that the factors of -45 you use are some form of 9 and 5, we can use the process of elimination to figure out which are the correct ones.

First, through FOIL u know that in any factored form the last two terms in each bracket multiply together to make the last term in the expanded form.

So first, look at A. the last two terms are -9 and -5, which = 45 when multiplied together. 45 does not = -45, so it can't be A.

B has 9 and 5. When they're multiplied, they = 45, which does not = -45, so its not B

It can't be C either, because the first term of the first bracket in C is 20, and when multiplied with x it doesn't produce x^2.

Therefore it has to be D. u can check this by multiplying -9 and 5, which = -45, the final term in the expanded form. Also, -9 + 5 = -4, which is the middle term of the expanded form.

You might be interested in
Kevin has $24 to buy a gift for his cousin. He found a gift for $22. With 5% sales tax added on, will Kevin have enough money to
mojhsa [17]

Answer:

Yes; $23.10

Step-by-step explanation:

5% of 22 is 1.10 and if you add the tax to the give price it is less than $24

8 0
3 years ago
A polynomial function can be written as (x 1)(x 4)(x − 7). what are the x-intercepts of the graph of this function? (1, 0), (4,
IrinaVladis [17]
Easy

set to zero
those are the roots or xintersepts

(x+1)(x+4)(x-7)=0

x+1=0
x=-1

x+4=0
x=-4

x-7=0
x=7

xints are (-4,0) (-1,0) (7,0)
5 0
3 years ago
Read 2 more answers
Dougie has a January hiking goal. Dougie
igomit [66]

Answer:

84 miles

Step-by-step explanation:

35% as a decimal is .35.

240*.35=84

7 0
3 years ago
Hey math can you help
HACTEHA [7]
So if we’re talking about meters per second, you would need to divide.

-17.5/5 = -3.5

NOW YOU THINK THATS YOUR ANSWER BUT NOO. You CANNOT have a negative second. So you take the absolute value of -3.5 and your answer would be 3.5

The rate of the anchor is 3.5 meters per second.
3 0
3 years ago
Solve exponents please help just this one u get 10 points
STALIN [3.7K]
I think it's equal to 1 because every expression with the exponent of zero is equal to 1, idk for sure though
8 0
3 years ago
Other questions:
  • Need help with this answer ​
    7·2 answers
  • Find the equation of a line that passes through the point (12,9)and has a slope of 1/4
    13·2 answers
  • What is the greatest common factor of 16a and 20ab<br><br> 2d and 10d
    8·2 answers
  • Will give Brainlyest. ASAP
    8·1 answer
  • The volume of a cylinder is 756 cm3 . the radius of the base of the cylinder is 6 cm .
    10·1 answer
  • (3+ 1/2) x 14 pls help me
    8·2 answers
  • 2(a -3) + 4b - 2(a -b -3) + 5<br> simplify
    11·2 answers
  • Does anyone know what the answer please??
    15·1 answer
  • PLZ HELP!!! BRAINLY GUARANTEED
    11·1 answer
  • Identify the equation that represents a proportional relationship.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!