Question

The solution set of x²-4x-21≤0 is

Answer 1

Step-by-step explanation:

x^2 -4x -21 < or = 0

x^2 -7x + 3x -21 < or = 0

x ( x-7) +3 (x-7) < or = 0

(x-7) (x+3)

thus, x-7 < or equal to 0

x is greater than or equal to 7

or

x+3 < or = 0

x is greater than or equal to -3

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