What are the solutions to the equation -3x^2=21x ?

The solutions to the equation -3x^2=21x are x=0,x=-7

Find the zeros of -3x^2=21x

The zeros of -3x^2=21x are x=0,x=-7

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- 3 x^{2} = 21 x

x = 0, x = - 7

Solution steps

- 3 x^{2} = 21 x

Move

21 x

to the left side

- 3 x^{2} - 21 x = 0

Factor

- 3 x^{2} - 21 x : - 3 x (x + 7)

- 3 x (x + 7) = 0

Using the Zero Factor Principle:

ab = 0

then

a = 0

b = 0

x = 0 or x + 7 = 0

Solve

x + 7 = 0 : x = - 7

The solutions to the quadratic equation are:

x = 0, x = - 7

(y - 7)^{2} - 8 = 0

p^{2} - 2 p - 8 = 0

(y - 7)^{2} - 9 = 0

x (3 x + 1) = x^{2} + 15

(4 x + 9) (5 x - 7) = 0

What are the solutions to the equation -3x^2=21x ?
The solutions to the equation -3x^2=21x are x=0,x=-7
Find the zeros of -3x^2=21x
The zeros of -3x^2=21x are x=0,x=-7