Answer:
b
Step-by-step explanation:
Answer:
x = -3.5 or -1
Step-by-step explanation:
Add 7 and factor.
2x^2 +9x +7 = 0
(2x +7)(x +1) = 0
x = -3.5 or x = -1 . . . . . values that make the factors zero
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<em>Comment on factoring</em>
Factoring ax^2 +bx +c = 0 requires you find factors of ac that have a sum of b. Here, you're looking for factors of 2·7 = 14 that have a sum of 9. If you're observant, you realize that 2+7=9, so 2 and 7 are the factors you want.
Now, you can write the factored form as ...
(ax +p)(ax +q)/a = 0 . . . . where p and q are the factors of ac we just found
The divisor "a" is used to simplify one or both of the factors. Here, we have ...
(2x +2)(2x +7)/2 = 0
(x +1)(2x +7) = 0 . . . . . . we removed a factor of 2 from the first binomial
She harvested 93 kg of apples.
First you need to set it up like this:
X/75=24/100
Then you cross multiply and get:
1800=100x
The you isolate the variable (divide both sides) and get 18
75+18=93
-10p+8=7p+12
8=17p+12
-4=17p
-4.25=p
Answer:
x = 2 ; y =1
Step-by-step explanation:
6x-2y=10 -----------------(i)
6x+3y=15 -------------(ii)
multiply (i) by (-1)
(i)* (-1) -6x + 2y = -10
(ii) <u> 6x + 3y = 15</u>
add, 5y = 5
y= 5/5
y = 1
Put y = 1 in (i)
6x - 2*1 = 10
6x - 2 = 10
6x = 10 + 2
6x = 12
x = 12/6
x = 2