21x2 + 15x = 0

Answer 1

If we have the expression 21x^2 + 15x = 0, we can solve for x by factoring out the common factor of x:

x(21x + 15) = 0

Now we can set each factor equal to zero and solve for x:

x = 0 or 21x + 15 = 0

Solving the second equation, we can subtract 15 from both sides:

21x = -15

Dividing both sides by 21:

x = -15/21

Simplifying the fraction:

x = -5/7

So the solutions to the equation 21x^2 + 15x = 0 are x = 0 and x = -5/7.