Answer:
1081
Step-by-step explanation:
Firstly you work out 20% of 25 then subtract it.
So 20% of 25 is 5. then you do 25-5 which is 20.
For
(a-b)(a+b)=a^2-b^2
x^2-y^2-14x+49
x^2-14x+49-y^2
(x-7)^2-y^2
(x-7-y)(x-7+y)
or
(x-y-7)(x+y-7)
Good morning ☕️
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Answer:
The answers that apply are A (x=-2) and C (x=1),
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Step-by-step explanation:
Actually , x= -2 apply because
If you look at the graph you will see that f(-2)=1.
See the point with coordinates (-2 , 1).
:)
2nd equation:
8 x-y=10 ⇒ y= 8 x-10
We will switch that in 1st equation:
8 x-10=x²+12 x+30, or:
x² + 4 x +40 = 0, a=1,B=4, c=40
Discriminant : D= b² - 4 ac= 16 - 160 = -144 and because it is negative there are no real solutions.
Answer: D)
