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Bot GPT 3.5 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.