X² - 3x - 10
x² = x * x
10 can be factored:
1 x 10 ⇒⇒⇒ difference between factors = 9
2 x 5 ⇒⇒⇒ difference between factors = 3 ⇒ (The correct pair)
(x-5)(x+2) = x(x+2) - 5(x+2)
= x² + 2x - 5x - 10
= x² - 3x - 10
∴ x - 5 = 0 ⇒⇒⇒ x = 5
x + 2 = 0 ⇒⇒⇒ x = -2
I have attached <span>algebra tiles for the given equation.</span>
The median means the number that is in the middle of the spnumber sequence in least to greatest.
1) number the numbers up. 2,2,3,6,7
2) start by crossing off the last from the greatest. Then you can see that 3 is the median.
Answer:
working together, they can paint the room in 4 hrs 14 min
Step-by-step explanation:
Multiply both sides by 72x
8x+%2B+9x+=+72
17x+=+72
x+=+4.24 hrs
.24%2A60+=+14.4
working together, they can paint the room in 4 hrs 14 min
Answer:
C, (12, -1)
Step-by-step explanation:
x - 2y = 14
x + 3y =9
Add 2y to both sides
x = 14 +2y
Substitute this into the second equation and solve
14 + 2y + 3y = 9
5y = 9 - 14 = -5
5y = -5
y = - 1
(you don't need to do this step because there is only one equation with y=-1, but just in case...)
Plug y into the first equation:
x - 2(-1) = 14
x - (-2)= x+2
x + 2 =14
x =12
Therefore, the answer is (12, -1)
The answer is C
Answer:
A
Step-by-step explanation:
it's done by pythagoreans theorem
√25-9=4