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Zigmanuir [339]
2 years ago
8

(3x-4)(x+5)= I need help with this fast

Mathematics
1 answer:
natali 33 [55]2 years ago
4 0

Answer:

3x^2+11x-20

Step-by-step explanation:

step 1 3x(x+5)-4(x+5)

step 2 3x(x+5)-4(x+5)= 3x^2+15-4(x+5)

step 3 3x^2+15x-4x+20

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If you know that 4 x 5 = 20 how can you use the Commutative order property of multiplication to find 5 x 4
notsponge [240]
Since you know what 4×5 is you just have to use the same answer
8 0
3 years ago
12 x (3 + 4) ÷2 - 10=
Serga [27]

Answer:

32

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
B: Alex is 12 years older than George.
UkoKoshka [18]

Answer:

The ratio of George age to Carl's age is 1:12.

Step-by-step explanation:

Let the age of George be 'g'.

Let the age of Alex be 'a'.

Also Let the age of Carl be 'c'.

Given:

The sum of their ages is 68.

So equation can be framed as;

g+a+c=68 \ \ \ \ equation 1

Also Given:

Alex is 12 years older than George.

So equation can be framed as;

a =g+12 \ \ \ \ equation \ 2

Now Given:

Carl is three times older than Alex.

c=3a

But a =g+12

So we get;

c = 3(g+12) \\\\c= 3g+36 \ \ \ \ equation \ 3

Now Substituting equation 2 and equation 3 in equation 1 we get;

g+a+c=68\\\\g+g+12+3g+36=68\\\\5g+48=68

Subtracting both side by 48 using subtraction property of equality we get;

5g+48-48=68-48\\\\5g=20

Now Dividing both side by 5 using Division property of equality we get;

\frac{5g}{5}=\frac{20}{5}\\\\g =4

Hence George age g = 4 \ years

Now Alex age a=g+12 = 4+12 =16\ years

Also Carl's age c=3g+36=3\times 4+36 =12+36 =48\ years

Now we need to find the ratio of George age to Carl's age.

\frac{g}{c}=\frac{4}{48} = \frac{1}{12}

Hence  the ratio of George age to Carl's age is 1:12.

3 0
3 years ago
9. (10x2 + 99x – 5) ÷ (x + 10) =
Goryan [66]

Answer:

4045.10

Step-by-step explanation:


6 0
3 years ago
(4x+7)^2=60 how to do extracting the square root?
4vir4ik [10]
(4x + 7)² = 60
(4x + 7)(4x + 7) = 60
(4x² + 28x + 28x + 49) = 60
4x² + 56x + 49 = 60
<u>                  -49   -49</u>
        4x² + 56x = 11
4x² + 56x - 11 = 11 - 11
4x² + 56x - 11 = 0
x = <u>-56 +/- √(56² - 4(4)(-11))</u>
                     2(4)
x = <u>-56 +/- √(3136 + 88)</u>
                     8
x = <u>-56 +/- √(3174)</u>
                 8
x = <u>-56 +/- 56.34</u>
               8
x = -7 +/- 7.0425
x = -7 + 7.70425       x = -7 - 7.70425
x = 0.70425              x = -14.70425
8 0
3 years ago
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