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Norma-Jean [14]
3 years ago
11

If

^2=ax^2+bx+c" align="absmiddle" class="latex-formula">, what is the value of a+b+c?
Mathematics
2 answers:
Vinvika [58]3 years ago
4 0

Answer:

64

Step-by-step explanation:

(3x+5)^2 = ax^2 +bx+c

FOIL the left side

(3x+5) (3x+5)

9x^2 +15x+15x+25

Combine like terms

9x^2 +30x+25

a=9

b= 30

c= 25

a+b+c = 9+30+25 = 64

enyata [817]3 years ago
3 0

Answer:

64

Step-by-step explanation:

(3x + 5)² = ax² + bx + c

9x² + 30x + 25 = ax² + bx + c

a = 9

b = 30

c = 25

a + b + c

9 + 30 + 25

64

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He height of a triangle is 9 m less than is base the area is 56 m^2 what is the length of the base?
zloy xaker [14]
Formula for area of triangle:
A= 1/2 bh
Where b is the base and h is the height of the triangle.
Here, h= b-9
A=56 m^2
Put values in formula.
56= 1/2 (b) (b-9)
56=b(b-9)/2
Multiply both sides by 2.
112=b^2-9b
or
b^2-9b-112=0
Factorise the equation.
b^2-16b+7b-112=0
b(b-16)+7(b-16)=0
(b+7)(b-16)=0
Using zero factor theorem.
b+7=0 or b=-7
and
b-16=0 or b=16
Ignore the value b=-7, because length cannot be negative.
So length of base=16 m

Answer: Base=16m


4 0
3 years ago
Ax+b=c for x how do I solve this can someone help explain it to me.
Dmitry [639]

Answer:

x= c - b / A

please look at the step by step explanation to better understand :)

Step-by-step explanation:

subtract b from the left side and right side

so you are left with Ax = c - b

divide what number c - b is by A

and you are left with x= c - b / A

5 0
3 years ago
Cindy and Zoey work at a store. Both girls earn $6.25 per hour
wolverine [178]

Answer:

Step-by-step explanation:

I think this is your full question, right?

<em>Cindy and Zoey work at a store. Both girls earn $6.25 per hour. During a normal week Cindy works 15 hours and  Zoey works 20 hours. The expression 6.25(15) + 6.25(20) can be used to calculate the total amount of money that the  girls earned in one week. Which expression shows another way to calculate the amount of money the girls earn in  one week?  </em>

My answer:

The expression shows another way must be equal to: <em>6.25(15) + 6.25(20)  </em>

<=> 6.25 (15+20)

Because both girls earn the same per hour.

8 0
3 years ago
Evaluate f(x) = 4x+5 for x = 1. A) -9 B) 1 C) 4 D) 9
olga nikolaevna [1]

Answer:

f(1) = 9

Step-by-step explanation:

Evaluate  f(x) = 4x+5 by replacing both instances of x with '1' as follows:

f(1) = 4(1) + 5 = 9

Thus, f(1) = 9

4 0
3 years ago
Read 2 more answers
Find the measure of angle A.<br> А<br> 64 + x<br> 85 + x<br> 55
saul85 [17]

Answer:

Your question is unclear

Step-by-step explanation:

7 0
3 years ago
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