Answer:
x=-1 or x=4
Step-by-step explanation:
First divide by 4 to get rid of the factor 4 at x², then you have:
x² - 3x - 4 = 0
to factor that, look for two numbers that when added, give -3, and when multiplied, give -4. This is guesswork but usually doable:
-4 + 1 = -3
-4 * 1 = -4
so -4 and +1 are our numbers.
The factorization is therefore: (x - 4)(x + 1) = 0, and the solutions are
x-4 = 0 or x+1 = 0, so x=4 or x=-1
Answer:
6A7C8B
Step-by-step explanation:
Add them in and try to solve for 7 and 6, for 8. I usually put all number on one side and all x on other side.
320 kilometers=?
1.6 kilometers=1mile
1mile x 320 kilometers/ 1.6 kilometers,
320 : 1.6= 200 miles
Answer: 320 kilometers equals 200 miles
Start at -4 and go to the right 6 times on the number line and you should end up with 2
20 - 12 = 8
He has 8 blue and yellow crayons altogether.
Yellow = x
Blue = 2 + x
2 + x + x = 8
2 + 2x = 8
Subtract 2 to both sides
2x = 6
Divide 2 to both sides
x = 3.
He has 3 yellow crayons.