Step 1: Isolate the absolute value
Step 2: Is the number on the other side of the equation negative?
Step 3: Write two equations without absolute value bars
Step 4: Solve both equations
Treat x^4 as the square of p: x^4 = p^2.
Then x^4 - 5x^2 - 36 = 0 becomes p^2 - 5p - 36 = 0.
This factors nicely, to (p-9)(p+4) = 0. Then p = 9 and p = -4.
Equating 9 and x^2, we find that x=3 or x=-3.
Equating -4 and x^2, we see that there's no real solution.
Show that both x=3 and x=-3 are real roots of x^4 - 5x^2 - 36 = 0.
(-7) squared is 49.
(-7) squared = -7 x -7 = 49
Basically, anything is squared with a number, just double it the number.
Answer:
yes because it | | means absolute value
Step-by-step explanation:
Answer:
Length=6 units
Width= 5 units
Step-by-step explanation:
Let, Width=W
Length=L
Width= (L-1) units
Area of the rectangle=30 square units
Area of a rectangle= Length*Width
Subtracting '30' both sides:
Taking common from the equation:
The length cannot be negative, therefore: Length=6 units
Width=Length-1
=6-1
=5 units