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Doss [256]
4 years ago
6

How to factorise by grouping for 7a, d and h

Mathematics
2 answers:
asambeis [7]4 years ago
7 0

Step-by-step explanation:

7a

x2 + 4x + ax + 4a

x2 + ax + 4x + 4a

x (x + a) + 4 (x + a)

:(x + 4)(x+a)

7d

x2+2x-ax-2a

x2-ax+2x-2a

x (x-a)+2 (x-a)

:(x+2)(x-a)

7h

x2-2bx-5x+10b

x2-5x-2bx+10b

x (x-5)-2b(x-5)

:(x-2b)(x-5)

Maksim231197 [3]4 years ago
5 0

Answer:

You have to take out the common terms :

Question A,

{x}^{2}  + 4x + ax + 4a

= x(x + 4) + a(x + 4)

= (x + a)(x + 4)

Question D,

{x}^{2}  + 2x - ax - 2a

= x(x  +  2) - a(x + 2)

= (x - a)(x + 2)

Question H,

{x}^{2}  - 2bx - 5x + 10b

= x(x - 2b) - 5(x - 2b)

= (x - 5)(x - 2b)

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Find the product of 2x2 + 3x - 6 and 4x3 - x + 7.​
yanalaym [24]

Answer:

8x^5 + 12x^4 - 26^3 + 11x^2 + 27x - 42

Step-by-step explanation:

(2x^2 + 3x - 6)(4x^3 - x + 7)

8x^5 -2x^3 +14x^2 + 12x^4 - 3x^2 + 21x -24x^3 + 6x - 42

8x^5 + 12x^4 - 26^3 + 11x^2 + 27x - 42

5 0
3 years ago
I'm having a hard time solving this<br> May I please have an explanation
Marina CMI [18]

Answer:

e = 9

Step-by-step explanation:

ok e is just x, so we have to get it alone

4e - 10 = 2e + 8

We move the 2 since its smaller than the 4, and we move it two the other side. 4-2=2 so the new e is 2, now that 8 is alone (since we moved the 2), we cant be having the e with the -10... like this..

2e - 10 = 8, so we now add 10 so it can go with the 8, the new equation is this..

2e = 18

18/2 = 9

simple explanation

4e - 10 = 2e + 8

2e = 18

e = 9

(does that make sense)

5 0
3 years ago
Read 2 more answers
Can someone please help me I’ve tried so many ways and still can’t get the answer.
mr Goodwill [35]

Answer:

15.22

Step-by-step explanation:

The equation of the circumference of a circle is 2(pi)r

This is actually because 2pi is angle of the arc that makes up the full circle (radians of course)

so a simple formula is:

arc length in radians X radius

radius = 4 cm

the area that the question wants is the oposite

of the 142 degree section so 360 - 142 = 218

218 degrees *  (pi/180) = 3.80482 rad

3.80482 * 4 = 15.21928 cm

3 0
3 years ago
I need help with #6 please.
oksano4ka [1.4K]
Answer: $440

Steps:

Retrace the math. Your total at the end was $22.00, before that you had a 10% tax so you multiply the tax in order to retrace that step. Next, multiply is by 2 as the 50% discount which gets you to $440
5 0
4 years ago
Sarah’s hand length is 20 cm. She measures the dimensions of her rectangular floor to be 18 by 22 hand lengths. Which of the fol
Temka [501]
Lenght=22 hand*(20 cm/1 hand)=440 cm
width=18 hand*(20 cm/1hand)=360 cm

Area=lenght x width.
Area=440 cm * 360 cm=158,400 cm²≈160,000 cm²

A) 160,000 cm²
7 0
3 years ago
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