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zhuklara [117]
3 years ago
9

Can someone clearly explain and workout Q19? Much appreciated

Mathematics
1 answer:
Anna007 [38]3 years ago
5 0
The x coefficient is 2
Take half of 2 to get 2/2 = 1
Square 1 to get 1^2 = 1

Add and subtract 1 to the expression. This is the same as adding 0. 

x^2 + 2x + 2
x^2 + 2x + 2 + 0
x^2 + 2x + 2 + (1-1)
(x^2 + 2x + 1) + 2 - 1
(x+1)^2 + 1

Answer: (x+1)^2 + 1

 
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What is the solution set of 4x^2-36= 0?<br><br> (-3)<br> (3)<br> (-3,3)
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Answer:

(-3, 3).

Step-by-step explanation:

4x^2-36= 0

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                 2x - 5y = 20

At the x-intercept, y=0 .

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At the y-intercept, x=0.

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3 years ago
Maria bought a hat for $45.she had to sell them at a loss of 5%.find the selling price of the hat?
BigorU [14]
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3 years ago
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Step-by-step explanation:

the general line equation format is

y = ax + b

a is the slope or gradient of the line. it is the ratio of "y coordinate change / x coordinate change".

b is the y-intercept, the y value when x = 0. we get this by putting one point into the equation and solve for b.

(i)

A (3, 5)

B (5, 9)

x changes by +2 (from 3 to 5).

y changes by +4 (from 5 to 9).

so, the slope (or gradient) is +4/+2 = 2

(ii)

the semi-finished equation is

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(iii)

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2 years ago
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