You can use z = x², then rewrite the equation as
4z²-21z+20 = 0
This factors as
(4z-5)(z-4) = 0
so has solutions
z = 5/4, 4
The solutions for x are then
x = ±√z = {-2, -(√5)/2, (√5)/2, 2}
At 2 minutes, the heart would beat 140 times.
700/10=70
140/70=2
Four dollar loss and four dollar profit cause its like -4 + 4 = 0
Answer:
12
Step-by-step explanation:
Look at a clock. 4 is opposite 10 on a clock with 12 numbers.
Answer:
it depends if x is alr negaitve...
two positives equal a positive
two negatives equal a poitive
one negative and one positive equals a negative
Step-by-step explanation:
hope it helped